Server　≫　Linux Server　≫　Fedora Core 6　≫　ＰＯＰ３サーバー

　
　 　
◆ POP3サーバ
　 　
　 POPサーバとはメールを受信するサーバのことです。

ここでは比較的設定の簡単な Dovecot と言うソフトを使いPOP3サーバを立ち上げます。
　 　
　 　
◆ dovecotのインストール
　 　
　

下記のように入力します。青文字が入力文字です。
　 　
　  
 [root@linux]# yum install dovecot    ← 入力
 Loading "installonlyn" plugin
 Setting up Install Process
 Setting up repositories
 core                             100% |=========================| 1.1 kB 00:00
 extras                           100% |=========================| 1.1 kB 00:00
 updates                          100% |=========================| 1.2 kB 00:00
 Reading repository metadata in from local files
 primary.xml.gz                   100% |=========================| 1.6 MB 00:54
 ################################################## 5033/5033
 Parsing package install arguments
 Resolving Dependencies
 --> Populating transaction set with selected packages. Please wait.
 ---> Downloading header for dovecot to pack into transaction set.
 dovecot-1.0-0.1.rc7.fc6.i        100% |=========================|  26 kB 00:00
 ---> Package dovecot.i386 0:1.0-0.1.rc7.fc6 set to be updated
 --> Running transaction check

 Dependencies Resolved

 =============================================================================
   Package              Arch       Version              Repository      Size
 =============================================================================
 Installing:
   dovecot              i386       1.0-0.1.rc7.fc6       core           1.4 M

 Transaction Summary
 =============================================================================
 Install   1 Package(s)
 Update    0 Package(s)
 Remove    0 Package(s)

 Total download size: 1.4 M
 Is this ok [y/N]:y    ← y を入力
 Downloading Packages:
 (1/1): dovecot-1.0-0.1.rc       100% |=========================| 1.4 MB 00:06
 Running Transaction Test
 Finished Transaction Test
 Transaction Test Succeeded
 Running Transaction
 Installing: dovecot                           ######################### [1/1]

 Installed: dovecot.i386 0:1.0-0.1.rc7.fc6
 Complete!    ← Complete! と表示されればインストール完了
　
　 　
　 　
◆ dovecotの設定
　 　
　 dovecotの設定ファイルを開きます。下記のように緑色の部分を黄色に変更（書き換え・削除）して下さい。赤文字は説明です。青文字が入力文字です。
　 　
　  
 [root@linux]# vi /etc/dovecot.conf    ← 入力
 
 ## Dovecot configuration file

 # If you're in a hurry, see http://wiki.dovecot.org/QuickConfiguration
 # "dovecot -n" command gives a clean output of the changed settings. Use it
 # instead of copy&pasting this file when posting to the Dovecot mailing list.

 # '#' character and everything after it is treated as comments. Extra spaces
 # and tabs are ignored. If you want to use either of these explicitly, put the
 # value inside quotes, eg.: key = "# char and trailing whitespace "

 # Default values are shown for each setting, it's not required to uncomment
 # any of the lines.

 # Base directory where to store runtime data.
 #base_dir = /var/run/dovecot/

 # Protocols we want to be serving: imap imaps pop3 pop3s
 # If you only want to use dovecot-auth, you can set this to "none".
 #protocols = imap imaps pop3 pop3s
　　　↓
 protocols = imap imaps pop3 pop3s　←　コメント解除

 # IP or host address where to listen in for connections. It's not currently
 # possible to specify multiple addresses. "*" listens in all IPv4 interfaces.
 # "[::]" listens in all IPv6 interfaces, but may also listen in all IPv4
 # interfaces depending on the operating system.
 #
 # If you want to specify ports for each service, you will need to configure
 # these settings inside the protocol imap/pop3 { ... } section, so you can
 # specify different ports for IMAP/POP3. For example:
 #   protocol imap {
　　   　↓
     protocol imap {　←　コメント解除
 #     listen = *:10143
　　   　↓
       listen = *:143　←　コメント解除 して変更
 #     ssl_listen = *:10943
　　　   ↓
       ssl_listen = *:943　←　コメント解除 して変更
 # ..
 #   }
　　　↓
     }　←　コメント解除
 #   protocol pop3 {
　　   　↓
     protocol pop3 {　←　コメント解除
 #     listen = *:10100
　　   　↓
       listen = *:110　←　コメント解除 して変更
       ssl_listen = *:995　←　 追記
 # ..
 #   }
　　　↓
     }　←　コメント解除
 #listen = [::]

 # Disable LOGIN command and all other plaintext authentications unless
 # SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP
 # matches the local IP (ie. you're connecting from the same computer), the
 # connection is considered secure and plaintext authentication is allowed.
 #disable_plaintext_auth = no

 # Should all IMAP and POP3 processes be killed when Dovecot master process
 # shuts down. Setting this to "no" means that Dovecot can be upgraded without
 # forcing existing client connections to close (although that could also be
 # a problem if the upgrade is eg. because of a security fix). This however
 # means that after master process has died, the client processes can't write
 # to log files anymore.
 #shutdown_clients = yes

 ##
 ## Logging
 ##

 # Use this logfile instead of syslog(). /dev/stderr can be used if you want to
 # use stderr for logging (ONLY /dev/stderr - otherwise it is closed).
 #log_path =

 # For informational messages, use this logfile instead of the default
 #info_log_path =

 # Prefix for each line written to log file. % codes are in strftime(3)
 # format.
 #log_timestamp = "%b %d %H:%M:%S "

 # Syslog facility to use if you're logging to syslog. Usually if you don't
 # want to use "mail", you'll use local0..local7. Also other standard
 # facilities are supported.
 #syslog_facility = mail

 ##
 ## SSL settings
 ##

 # IP or host address where to listen in for SSL connections. Defaults
 # to above if not specified.
 #ssl_listen =

 # Disable SSL/TLS support.
 #ssl_disable = no

 # PEM encoded X.509 SSL/TLS certificate and private key. They're opened before
 # dropping root privileges, so keep the key file unreadable by anyone but
 # root. Included doc/mkcert.sh can be used to easily generate self-signed
 # certificate, just make sure to update the domains in dovecot-openssl.cnf
 #ssl_cert_file = /etc/pki/dovecot/certs/dovecot.pem
 #ssl_key_file = /etc/pki/dovecot/private/dovecot.pem

 # If key file is password protected, give the password here. Alternatively
 # give it when starting dovecot with -p parameter.
 #ssl_key_password =

 # File containing trusted SSL certificate authorities. Usually not needed.
 #ssl_ca_file =

 # Request client to send a certificate.
 #ssl_verify_client_cert = no

 # How often to regenerate the SSL parameters file. Generation is quite CPU
 # intensive operation. The value is in hours, 0 disables regeneration
 # entirely.
 #ssl_parameters_regenerate = 168

 # SSL ciphers to use
 #ssl_cipher_list = ALL:!LOW

 # Show protocol level SSL errors.
 #verbose_ssl = no##
 ## Login processes
 ##

 # Directory where authentication process places authentication UNIX sockets
 # which login needs to be able to connect to. The sockets are created when
 # running as root, so you don't have to worry about permissions. Note that
 # everything in this directory is deleted when Dovecot is started.
 #login_dir = /var/run/dovecot/login

 # chroot login process to the login_dir. Only reason not to do this is if you
 # wish to run the whole Dovecot without roots.
 # http://wiki.dovecot.org/Rootless
 #login_chroot = yes

 # User to use for the login process. Create a completely new user for this,
 # and don't use it anywhere else. The user must also belong to a group where
 # only it has access, it's used to control access for authentication process.
 # Note that this user is NOT used to access mails.
 # http://wiki.dovecot.org/UserIds
 #login_user = dovecot

 # Set max. process size in megabytes. If you don't use
 # login_process_per_connection you might need to grow this.
 #login_process_size = 32

 # Should each login be processed in it's own process (yes), or should one
 # login process be allowed to process multiple connections (no)? Yes is more
 # secure, espcially with SSL/TLS enabled. No is faster since there's no need
 # to create processes all the time.
 #login_process_per_connection = yes

 # Number of login processes to keep for listening new connections.
 #login_processes_count = 3

 # Maximum number of login processes to create. The listening process count
 # usually stays at login_processes_count, but when multiple users start logging
 # in at the same time more extra processes are created. To prevent fork-bombing
 # we check only once in a second if new processes should be created - if all
 # of them are used at the time, we double their amount until the limit set by
 # this setting is reached.
 #login_max_processes_count = 128

 # Maximum number of connections allowed per each login process. This setting
 # is used only if login_process_per_connection=no. Once the limit is reached,
 # the process notifies master so that it can create a new login process.
 # You should make sure that the process has at least
 # 16 + login_max_connections * 2 available file descriptors.
 #login_max_connections = 256

 # Greeting message for clients.
 #login_greeting = Dovecot ready.

 # Space-separated list of elements we want to log. The elements which have
 # a non-empty variable value are joined together to form a comma-separated
 # string.
 #login_log_format_elements = user=<%u> method=%m rip=%r lip=%l %c

 # Login log format. %$ contains login_log_format_elements string, %s contains
 # the data we want to log.
 #login_log_format = %$: %s

 ##
 ## Mailbox locations and namespaces
 ##

 # Location for users' mailboxes. This is the same as the old default_mail_env
 # setting. The default is empty, which means that Dovecot tries to find the
 # mailboxes automatically. This won't work if the user doesn't have any mail
 # yet, so you should explicitly tell Dovecot the full location.
 #
 # If you're using mbox, giving a path to the INBOX file (eg. /var/mail/%u)
 # isn't enough. You'll also need to tell Dovecot where the other mailboxes are
 # and where Dovecot can place its index files. This is called the "root mail
 # directory", and it must be the first path given in the mail_location setting.
 #
 # There are a few special variables you can use, eg.:
 #
 # %u - username
 # %n - user part in user@domain, same as %u if there's no domain
 # %d - domain part in user@domain, empty if there's no domain
 # %h - home directory
 #
 # See doc/wiki/Variables.txt for full list. Some examples:
 #
 # mail_location = maildir:~/Maildir
 # mail_location = mbox:~/mail:INBOX=/var/mail/%u
 # mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n
 #
 # <doc/wiki/MailLocation.txt>
 #
 #mail_location
 mail_location = maildir:~/Maildir　←　追記
 

 # If you need to set multiple mailbox locations or want to change default
 # namespace settings, you can do it by defining namespace sections:
 #
 # You can have private, shared and public namespaces. The only difference
 # between them is how Dovecot announces them to client via NAMESPACE
 # extension. Shared namespaces are meant for user-owned mailboxes which are
 # shared to other users, while public namespaces are for more globally
 # accessible mailboxes.
 #
 # REMEMBER: If you add any namespaces, the default namespace must be added
 # explicitly, ie. default_mail_env does nothing unless you have a namespace
 # without a location setting. Default namespace is simply done by having a
 # namespace with empty prefix.
 #namespace private {
 # Hierarchy separator to use. You should use the same separator for all
 # namespaces or some clients get confused. '/' is usually a good one.
 # The default however depends on the underlying mail storage format.
 #separator =

 # Prefix required to access this namespace. This needs to be different for
 # all namespaces. For example "Public/".
 #prefix =

 # Physical location of the mailbox. This is in same format as
 # default_mail_env, which is also the default for it.
 #location =

 # There can be only one INBOX, and this setting defines which namespace
 # has it.
 #inbox = yes

 # If namespace is hidden, it's not advertised to clients via NAMESPACE
 # extension or shown in LIST replies. This is mostly useful when converting
 # from another server with different namespaces which you want to depricate
 # but still keep working. For example you can create hidden namespaces with
 # prefixes "~/mail/", "~%u/mail/" and "mail/".
 #hidden = yes
 #}

 # Grant access to these extra groups for mail processes. Typical use would be
 # to give "mail" group write access to /var/mail to be able to create dotlocks.
 #mail_extra_groups =

 # Allow full filesystem access to clients. There's no access checks other than
 # what the operating system does for the active UID/GID. It works with both
 # maildir and mboxes, allowing you to prefix mailboxes names with eg. /path/
 # or ~user/.
 #mail_full_filesystem_access = no

 ##
 ## Mail processes
 ##

 # Enable mail process debugging. This can help you figure out why Dovecot
 # isn't finding your mails.
 #mail_debug = no

 # Log prefix for mail processes. See doc/variables.txt for list of possible
 # variables you can use.
 #mail_log_prefix = "%Us(%u): "

 # Use mmap() instead of read() to read mail files. read() seems to be a bit
 # faster with my Linux/x86 and it's better with NFS, so that's the default.
 # Note that OpenBSD 3.3 and older don't work right with mail_read_mmaped = yes.
 #mail_read_mmaped = no

 # Don't use mmap() at all. This is required if you store indexes to shared
 # filesystems (NFS or clustered filesystem).
 #mmap_disable = no

 # Don't write() to mmaped files. This is required for some operating systems
 # which use separate caches for them, such as OpenBSD.
 #mmap_no_write = no

 # Locking method for index files. Alternatives are fcntl, flock and dotlock.
 # Dotlocking uses some tricks which may create more disk I/O than other locking
 # methods. NOTE: If you use NFS, remember to change also mmap_disable setting!
 #lock_method = fcntl

 # Drop all privileges before exec()ing the mail process. This is mostly
 # meant for debugging, otherwise you don't get core dumps. It could be a small
 # security risk if you use single UID for multiple users, as the users could
 # ptrace() each others processes then.
 #mail_drop_priv_before_exec = no

 # Show more verbose process titles (in ps). Currently shows user name and
 # IP address. Useful for seeing who are actually using the IMAP processes
 # (eg. shared mailboxes or if same uid is used for multiple accounts).
 #verbose_proctitle = no

 # Valid UID range for users, defaults to 500 and above. This is mostly
 # to make sure that users can't log in as daemons or other system users.
 # Note that denying root logins is hardcoded to dovecot binary and can't
 # be done even if first_valid_uid is set to 0.
 #first_valid_uid = 500
 #last_valid_uid = 0

 # Valid GID range for users, defaults to non-root/wheel. Users having
 # non-valid GID as primary group ID aren't allowed to log in. If user
 # belongs to supplementary groups with non-valid GIDs, those groups are
 # not set.
 #first_valid_gid = 1
 #last_valid_gid = 0

 # Maximum number of running mail processes. When this limit is reached,
 # new users aren't allowed to log in.
 #max_mail_processes = 1024

 # Set max. process size in megabytes. Most of the memory goes to mmap()ing
 # files, so it shouldn't harm much even if this limit is set pretty high.
 #mail_process_size = 256

 # Maximum allowed length for mail keyword name. It's only forced when trying
 # to create new keywords.
 #mail_max_keyword_length = 50

 # Default umask to use for mail files and directories.
 #umask = 0077

 # ':' separated list of directories under which chrooting is allowed for mail
 # processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar too).
 # This setting doesn't affect login_chroot or auth_chroot variables.
 # WARNING: Never add directories here which local users can modify, that
 # may lead to root exploit. Usually this should be done only if you don't
 # allow shell access for users. See doc/configuration.txt for more information.
 #valid_chroot_dirs =
　　　↓
 valid_chroot_dirs = /home　←　コメント解除して追記

 # Default chroot directory for mail processes. This can be overridden for
 # specific users in user database by giving /./ in user's home directory
 # (eg. /home/./user chroots into /home). Note that usually there is no real
 # need to do chrooting, Dovecot doesn't allow users to access files outside
 # their mail directory anyway.
 #mail_chroot =

 ##
 ## Mailbox handling optimizations
 ##

 # Space-separated list of fields to initially save into cache file. Currently
 # these fields are allowed:
 #
 # flags, date.sent, date.received, size.virtual, size.physical
 # mime.parts, imap.body, imap.bodystructure
 #
 # Different IMAP clients work in different ways, so they benefit from
 # different cached fields. Some do not benefit from them at all. Caching more
 # than necessary generates useless disk I/O, so you don't want to do that
 # either.
 #
 # Dovecot attempts to automatically figure out what client wants and it keeps
 # only that. However the first few times a mailbox is opened, Dovecot hasn't
 # yet figured out what client needs, so it may not perform optimally. If you
 # know what fields the majority of your clients need, it may be useful to set
 # these fields by hand. If client doesn't actually use them, Dovecot will
 # eventually drop them.
 #
 # Usually you should just leave this field alone. The potential benefits are
 # typically unnoticeable.
 #mail_cache_fields =

 # Space-separated list of fields that Dovecot should never save to cache file.
 # Useful if you want to save disk space at the cost of more I/O when the fields
 # needed.
 #mail_never_cache_fields =

 # The minimum number of mails in a mailbox before updates are done to cache
 # file. This allows optimizing Dovecot's behavior to do less disk writes at
 # the cost of more disk reads.
 #mail_cache_min_mail_count = 0

 # When IDLE command is running, mailbox is checked once in a while to see if
 # there are any new mails or other changes. This setting defines the minimum
 # time to wait between those checks. Dovecot is however able to use dnotify
 # and inotify with Linux to reply immediately after the change occurs.
 #mailbox_idle_check_interval = 30

 # Save mails with CR+LF instead of plain LF. This makes sending those mails
 # take less CPU, especially with sendfile() syscall with Linux and FreeBSD.
 # But it also creates a bit more disk I/O which may just make it slower.
 # Also note that if other software reads the mboxes/maildirs, they may handle
 # the extra CRs wrong and cause problems.
 #mail_save_crlf = no

 ##
 ## Maildir-specific settings
 ##

 # By default LIST command returns all entries in maildir beginning with dot.
 # Enabling this option makes Dovecot return only entries which are directories.
 # This is done by stat()ing each entry, so it causes more disk I/O.
 # (For systems setting struct dirent->d_type, this check is free and it's
 # done always regardless of this setting)
 #maildir_stat_dirs = no

 # Copy mail to another folders using hard links. This is much faster than
 # actually copying the file. This is problematic only if something modifies
 # the mail in one folder but doesn't want it modified in the others. I don't
 # know any MUA which would modify mail files directly. IMAP protocol also
 # requires that the mails don't change, so it would be problematic in any case.
 # If you care about performance, enable it.
 #maildir_copy_with_hardlinks = no

 ##
 ## mbox-specific settings
 ##

 # Which locking methods to use for locking mbox. There are four available:
 # dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe
 # solution. If you want to use /var/mail/ like directory, the users
 # will need write access to that directory.
 # fcntl : Use this if possible. Works with NFS too if lockd is used.
 # flock : May not exist in all systems. Doesn't work with NFS.
 # lockf : May not exist in all systems. Doesn't work with NFS.
 #
 # You can use multiple locking methods; if you do the order they're declared
 # in is important to avoid deadlocks if other MTAs/MUAs are using multiple
 # locking methods as well. Some operating systems don't allow using some of
 # them simultaneously.
 #mbox_read_locks = fcntl
 #mbox_write_locks = fcntl

 # Maximum time in seconds to wait for lock (all of them) before aborting.
 #mbox_lock_timeout = 300

 # If dotlock exists but the mailbox isn't modified in any way, override the
 # lock file after this many seconds.
 #mbox_dotlock_change_timeout = 120

 # When mbox changes unexpectedly we have to fully read it to find out what
 # changed. If the mbox is large this can take a long time. Since the change
 # is usually just a newly appended mail, it'd be faster to simply read the
 # new mails. If this setting is enabled, Dovecot does this but still safely
 # fallbacks to re-reading the whole mbox file whenever something in mbox isn't
 # how it's expected to be. The only real downside to this setting is that if
 # some other MUA changes message flags, Dovecot doesn't notice it immediately.
 # Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK
 # commands.
 #mbox_dirty_syncs = yes

 # Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE,
 # EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored.
 #mbox_very_dirty_syncs = no

 # Delay writing mbox headers until doing a full write sync (EXPUNGE and CHECK
 # commands and when closing the mailbox). This is especially useful for POP3
 # where clients often delete all mails. The downside is that our changes
 # aren't immediately visible to other MUAs.
 #mbox_lazy_writes = yes

 # If mbox size is smaller than this (in kilobytes), don't write index files.
 # If an index file already exists it's still read, just not updated.
 #mbox_min_index_size = 0

 ##
 ## dbox-specific settings
 ##

 # Maximum dbox file size in kilobytes until it's rotated.
 #dbox_rotate_size = 2048

 # Minimum dbox file size in kilobytes before it's rotated
 # (overrides dbox_rotate_days)
 #dbox_rotate_min_size = 16

 # Maximum dbox file age in days until it's rotated. Day always begins from
 # midnight, so 1 = today, 2 = yesterday, etc. 0 = check disabled.
 #dbox_rotate_days = 0

 ##
 ## IMAP specific settings
 ##

 protocol imap {
 # Login executable location.
 #login_executable = /usr/libexec/dovecot/imap-login

 # IMAP executable location. Changing this allows you to execute other
 # binaries before the imap process is executed.
 #
 # This would write rawlogs into ~/dovecot.rawlog/ directory:
 # mail_executable = /usr/libexec/dovecot/rawlog /usr/libexec/dovecot/imap
 #
 # This would attach gdb into the imap process and write backtraces into
 # /tmp/gdbhelper.* files:
 # mail_executable = /usr/libexec/dovecot/gdbhelper /usr/libexec/dovecot/imap
 #
 #mail_executable = /usr/libexec/dovecot/imap

 # Maximum IMAP command line length in bytes. Some clients generate very long
 # command lines with huge mailboxes, so you may need to raise this if you get
 # "Too long argument" or "IMAP command line too large" errors often.
 #imap_max_line_length = 65536

 # Support for dynamically loadable plugins. mail_plugins is a space separated
 # list of plugins to load.
 #mail_plugins =
 #mail_plugin_dir = /usr/lib/dovecot/imap

 # Send IMAP capabilities in greeting message. This makes it unnecessary for
 # clients to request it with CAPABILITY command, so it saves one round-trip.
 # Many clients however don't understand it and ask the CAPABILITY anyway.
 #login_greeting_capability = no

 # Workarounds for various client bugs:
 # delay-newmail:
 # Send EXISTS/RECENT new mail notifications only when replying to NOOP
 # and CHECK commands. Some clients ignore them otherwise, for example
 # OSX Mail. Outlook Express breaks more badly though, without this it
 # may show user "Message no longer in server" errors. Note that OE6 still
 # breaks even with this workaround if synchronization is set to
 # "Headers Only".
 # outlook-idle:
 # Outlook and Outlook Express never abort IDLE command, so if no mail
 # arrives in half a hour, Dovecot closes the connection. This is still
 # fine, except Outlook doesn't connect back so you don't see if new mail
 # arrives.
 # netscape-eoh:
 # Netscape 4.x breaks if message headers don't end with the empty "end of
 # headers" line. Normally all messages have this, but setting this
 # workaround makes sure that Netscape never breaks by adding the line if
 # it doesn't exist. This is done only for FETCH BODY[HEADER.FIELDS..]
 # commands. Note that RFC says this shouldn't be done.
 # tb-extra-mailbox-sep:
 # With mbox storage a mailbox can contain either mails or submailboxes,
 # but not both. Thunderbird separates these two by forcing server to
 # accept '/' suffix in mailbox names in subscriptions list.
 # The list is space-separated.
 #imap_client_workarounds = outlook-idle
 }

 ##
 ## POP3 specific settings
 ##

 protocol pop3 {
 # Login executable location.
 #login_executable = /usr/libexec/dovecot/pop3-login

 # POP3 executable location
 #mail_executable = /usr/libexec/dovecot/pop3

 # Don't try to set mails non-recent or seen with POP3 sessions. This is
 # mostly intended to reduce disk I/O. With maildir it doesn't move files
 # from new/ to cur/, with mbox it doesn't write Status-header.
 #pop3_no_flag_updates = no

 # Support LAST command which exists in old POP3 specs, but has been removed
 # from new ones. Some clients still wish to use this though. Enabling this
 # makes RSET command clear all \Seen flags from messages.
 #pop3_enable_last = no

 # If mail has X-UIDL header, use it as the mail's UIDL.
 #pop3_reuse_xuidl = no

 # Keep the mailbox locked for the entire POP3 session.
 #pop3_lock_session = no

 # POP3 UIDL format to use. You can use following variables:
 #
 # %v - Mailbox UIDVALIDITY
 # %u - Mail UID
 # %m - MD5 sum of the mailbox headers in hex (mbox only)
 # %f - filename (maildir only)
 #
 # If you want UIDL compatibility with other POP3 servers, use:
 # UW's ipop3d : %08Xv%08Xu
 # Courier version 0 : %f
 # Courier version 1 : %u
 # Courier version 2 : %v-%u
 # Cyrus (<= 2.1.3) : %u
 # Cyrus (>= 2.1.4) : %v.%u
 # Older Dovecots : %v.%u
 # tpop3d : %Mf
 #
 # Note that Outlook 2003 seems to have problems with %v.%u format which was
 # Dovecot's default, so if you're building a new server it would be a good
 # idea to change this. %08Xu%08Xv should be pretty fail-safe.
 #
 # NOTE: Nowadays this is required to be set explicitly, since the old
 # default was bad but it couldn't be changed without breaking existing
 # installations. %08Xu%08Xv will be the new default, so use it for new
 # installations.
 #
 #pop3_uidl_format = %08Xu%08Xv
　　　↓
 pop3_uidl_format = %08Xu%08Xv　←　コメント解除
 
 # POP3 logout format string:
 # %t - number of TOP commands
 # %p - number of bytes sent to client as a result of TOP command
 # %r - number of RETR commands
 # %b - number of bytes sent to client as a result of RETR command
 # %d - number of deleted messages
 # %m - number of messages (before deletion)
 # %s - mailbox size in bytes (before deletion)
 #pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s

 # Support for dynamically loadable plugins. mail_plugins is a space separated
 # list of plugins to load.
 #mail_plugins =
 #mail_plugin_dir = /usr/lib/dovecot/pop3

 # Workarounds for various client bugs:
 # outlook-no-nuls:
 # Outlook and Outlook Express hang if mails contain NUL characters.
 # This setting replaces them with 0x80 character.
 # oe-ns-eoh:
 # Outlook Express and Netscape Mail breaks if end of headers-line is
 # missing. This option simply sends it if it's missing.
 # The list is space-separated.
 #pop3_client_workarounds =
 }

 ##
 ## LDA specific settings
 ##

 protocol lda {
 # Address to use when sending rejection mails.
 postmaster_address = postmaster@example.com

 # Hostname to use in various parts of sent mails, eg. in Message-Id.
 # Default is the system's real hostname.
 #hostname =

 # Support for dynamically loadable plugins. mail_plugins is a space separated
 # list of plugins to load.
 #mail_plugins =
 #mail_plugin_dir = /usr/lib/dovecot/lda

 # Binary to use for sending mails.
 #sendmail_path = /usr/lib/sendmail

 # UNIX socket path to master authentication server to find users.
 #auth_socket_path = /var/run/dovecot/auth-master
 }

 ##
 ## Authentication processes
 ##

 # Executable location
 #auth_executable = /usr/libexec/dovecot/dovecot-auth

 # Set max. process size in megabytes.
 #auth_process_size = 256

 # Authentication cache size in kilobytes. 0 means it's disabled.
 # Note that bsdauth, PAM and vpopmail require cache_key to be set for caching
 # to be used. Also note that currently auth cache doesn't work very well if
 # you're using multiple passdbs with same usernames in them.
 #auth_cache_size = 0
 # Time to live in seconds for cached data. After this many seconds the cached
 # record is no longer used, *except* if the main database lookup returns
 # internal failure.
 #auth_cache_ttl = 3600

 # Space separated list of realms for SASL authentication mechanisms that need
 # them. You can leave it empty if you don't want to support multiple realms.
 # Many clients simply use the first one listed here, so keep the default realm
 # first.
 #auth_realms =

 # Default realm/domain to use if none was specified. This is used for both
 # SASL realms and appending @domain to username in plaintext logins.
 #auth_default_realm =

 # List of allowed characters in username. If the user-given username contains
 # a character not listed in here, the login automatically fails. This is just
 # an extra check to make sure user can't exploit any potential quote escaping
 # vulnerabilities with SQL/LDAP databases. If you want to allow all characters,
 # set this value to empty.
 #auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@

 # Username character translations before it's looked up from databases. The
 # value contains series of from -> to characters. For example "#@/@" means
 # that '#' and '/' characters are translated to '@'.
 #auth_username_translation =

 # Username formatting before it's looked up from databases. You can use
 # the standard variables here, eg. %Lu would lowercase the username, %n would
 # drop away the domain if it was given, or "%n-AT-%d" would change the '@' into
 # "-AT-". This translation is done after auth_username_translation changes.
 #auth_username_format =

 # If you want to allow master users to log in by specifying the master
 # username within the normal username string (ie. not using SASL mechanism's
 # support for it), you can specify the separator character here. The format
 # is then <username><separator><master username>. UW-IMAP uses "*" as the
 # separator, so that could be a good choice.
 #auth_master_user_separator =

 # Username to use for users logging in with ANONYMOUS SASL mechanism
 #auth_anonymous_username = anonymous

 # More verbose logging. Useful for figuring out why authentication isn't
 # working.
 #auth_verbose = no

 # Even more verbose logging for debugging purposes. Shows for example SQL
 # queries.
 #auth_debug = no

 # In case of password mismatches, log the passwords and used scheme so the
 # problem can be debugged. Requires auth_debug=yes to be set.
 #auth_debug_passwords = no

 # Maximum number of dovecot-auth worker processes. They're used to execute
 # blocking passdb and userdb queries (eg. MySQL and PAM). They're
 # automatically created and destroyed as needed.
 #auth_worker_max_count = 30

 # Kerberos keytab to use for the GSSAPI mechanism. Will use the system
 # default (usually /etc/krb5.keytab) if not specified.
 #auth_krb5_keytab =

 auth default {
 # Space separated list of wanted authentication mechanisms:
 # plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi
 mechanisms = plain

 #
 # Password database is used to verify user's password (and nothing more).
 # You can have multiple passdbs and userdbs. This is useful if you want to
 # allow both system users (/etc/passwd) and virtual users to login without
 # duplicating the system users into virtual database.
 #
 # http://wiki.dovecot.org/Authentication
 #
 # By adding master=yes setting inside a passdb you make the passdb a list
 # of "master users", who can log in as anyone else. Unless you're using PAM,
 # you probably still want the destination user to be looked up from passdb
 # that it really exists. This can be done by adding pass=yes setting to the
 # master passdb.
 #
 # http://wiki.dovecot.org/MasterPassword

 # Users can be temporarily disabled by adding a passdb with deny=yes.
 # If the user is found from that database, authentication will fail.
 # The deny passdb should always be specified before others, so it gets
 # checked first. Here's an example:

 #passdb passwd-file {
 # File contains a list of usernames, one per line
 #args = /etc/dovecot.deny
 #deny = yes
 #}

 # PAM authentication. Preferred nowadays by most systems.
 # Note that PAM can only be used to verify if user's password is correct,
 # so it can't be used as userdb. If you don't want to use a separate user
 # database (passwd usually), you can use static userdb.
 # REMEMBER: You'll need /etc/pam.d/dovecot file created for PAM
 # authentication to actually work.
 passdb pam {
 # [session=yes] [setcred=yes] [cache_key=<key>] [<service name>]
 #
 # session=yes makes Dovecot open and immediately close PAM session. Some
 # PAM plugins need this to work, such as pam_mkhomedir.
 #
 # setcred=yes makes Dovecot establish PAM credentials if some PAM plugins
 # need that. They aren't ever deleted though, so this isn't enabled by
 # default.
 #
 # cache_key can be used to enable authentication caching for PAM
 # (auth_cache_size also needs to be set). It isn't enabled by default
 # because PAM modules can do all kinds of checks besides checking password,
 # such as checking IP address. Dovecot can't know about these checks
 # without some help. cache_key is simply a list of variables (see
 # doc/variables.txt) which must match for the cached data to be used.
 # Here are some examples:
 # %u - Username must match. Probably sufficient for most uses.
 # %u%r - Username and remote IP address must match.
 # %u%s - Username and service (ie. IMAP, POP3) must match.
 #
 # If service name is "*", it means the authenticating service name
 # is used, eg. pop3 or imap (/etc/pam.d/pop3, /etc/pam.d/imap).
 #
 # Some examples:
 # args = session=yes *
 # args = cache_key=%u dovecot
 #args = dovecot
 }

 # /etc/passwd or similar, using getpwnam()
 # In many systems nowadays this uses Name Service Switch, which is
 # configured in /etc/nsswitch.conf.
 #passdb passwd {
 #}

 # /etc/shadow or similiar, using getspnam(). Deprecated by PAM nowadays.
 #passdb shadow {
 #}

 # BSD authentication. Used by at least OpenBSD.
 #passdb bsdauth {
 # [cache_key=<key>] - See cache_key in PAM for explanation.
 #args =
 #}

 # passwd-like file with specified location
 #passdb passwd-file {
 # Path for passwd-file
 #args =
 #}

 # checkpassword executable authentication
 # NOTE: You will probably want to use "userdb prefetch" with this.
 #passdb checkpassword {
 # Path for checkpassword binary
 #args =
 #}

 # SQL database
 #passdb sql {
 # Path for SQL configuration file, see doc/dovecot-sql.conf for example
 #args =
 #}

 # LDAP database
 #passdb ldap {
 # Path for LDAP configuration file, see doc/dovecot-ldap.conf for example
 #args =
 #}

 # vpopmail authentication
 #passdb vpopmail {
 # [cache_key=<key>] - See cache_key in PAM for explanation.
 #args =
 #}

 #
 # User database specifies where mails are located and what user/group IDs
 # own them. For single-UID configuration use "static".
 #
 # http://wiki.dovecot.org/Authentication
 # http://wiki.dovecot.org/VirtualUsers
 #

 # /etc/passwd or similar, using getpwnam()
 # In many systems nowadays this uses Name Service Switch, which is
 # configured in /etc/nsswitch.conf.
 userdb passwd {
 }

 # passwd-like file with specified location
 #userdb passwd-file {
 # Path for passwd-file
 #args =
 #}

 # static settings generated from template
 #userdb static {
 # Template for settings. Can return anything a userdb could normally
 # return, eg.: uid, gid, home, mail, nice
 #
 # A few examples:
 #
 # args = uid=500 gid=500 home=/var/mail/%u
 # args = uid=500 gid=500 home=/home/%u mail=mbox:/home/%u/mail nice=10
 #
 #args =
 #}

 # SQL database
 #userdb sql {
 # Path for SQL configuration file, see doc/dovecot-sql.conf for example
 #args =
 #}

 # LDAP database
 #userdb ldap {
 # Path for LDAP configuration file, see doc/dovecot-ldap.conf for example
 #args =
 #}

 # vpopmail
 #userdb vpopmail {
 #}

 # "prefetch" user database means that the passdb already provided the
 # needed information and there's no need to do a separate userdb lookup.
 # This can be made to work with SQL and LDAP databases, see their example
 # configuration files for more information how to do it.
 # http://wiki.dovecot.org/AuthSpecials
 #userdb prefetch {
 #}

 # User to use for the process. This user needs access to only user and
 # password databases, nothing else. Only shadow and pam authentication
 # requires roots, so use something else if possible. Note that passwd
 # authentication with BSDs internally accesses shadow files, which also
 # requires roots. Note that this user is NOT used to access mails.
 # That user is specified by userdb above.
 user = root

 # Directory where to chroot the process. Most authentication backends don't
 # work if this is set, and there's no point chrooting if auth_user is root.
 # Note that valid_chroot_dirs isn't needed to use this setting.
 #chroot =

 # Number of authentication processes to create
 #count = 1

 # Require a valid SSL client certificate or the authentication fails.
 #ssl_require_client_cert = no

 # Take the username from client's SSL certificate, using X509_NAME_oneline()
 # which typically uses subject's Distinguished Name.
 #ssl_username_from_cert = no

 # It's possible to export the authentication interface to other programs:
 #socket listen {
 #master {
 # Master socket is typically used to give Dovecot's local delivery
 # agent access to userdb so it can find mailbox locations. It can
 # however also be used to disturb regular user authentications.
 # WARNING: Giving untrusted users access to master socket may be a
 # security risk, don't give too wide permissions to it!
 #path = /var/run/dovecot/auth-master
 #mode = 0600
 # Default user/group is the one who started dovecot-auth (root)
 #user =
 #group =
 #}
 #client {
 # The client socket is generally safe to export to everyone. Typical use
 # is to export it to your SMTP server so it can do SMTP AUTH lookups
 # using it.
 #path = /var/run/dovecot/auth-client
 #mode = 0660
 #}
 #}
 }

 # If you wish to use another authentication server than dovecot-auth, you can
 # use connect sockets. They assumed to be already running, Dovecot's master
 # process only tries to connect to them. They don't need any other settings
 # than the path for the master socket, as the configuration is done elsewhere.
 # Note that the client sockets must exist in the login_dir.
 #auth external {
 # socket connect {
 # master {
 # path = /var/run/dovecot/auth-master
 # }
 # }
 #}

 ##
 ## Dictionary server settings
 ##

 # Dictionary can be used by some plugins to store key=value lists.
 # Currently this is only used by dict quota backend. The dictionary can be
 # used either directly or though a dictionary server. The following dict block
 # maps dictionary names to URIs when the server is used. These can then be
 # referenced using URIs in format "proxy:<name>".

 dict {
 #quota = mysql:/etc/dovecot-dict-quota.conf
 }

 ##
 ## Plugin settings
 ##

 plugin {
 # Here you can give some extra environment variables to mail processes.
 # This is mostly meant for passing parameters to plugins. %variable
 # expansion is done for all values.

 # Quota plugin. Multiple backends are supported:
 # dirsize: Find and sum all the files found from mail directory
 # dict: Keep quota stored in dictionary (eg. SQL)
 # maildir: Maildir++ quota
 # fs: Read-only support for filesystem quota
 #quota = maildir

 # ACL plugin. vfile backend reads ACLs from "dovecot-acl" file from maildir
 # directory. You can also optionally give a global ACL directory path where
 # ACLs are applied to all users' mailboxes. The global ACL directory contains
 # one file for each mailbox, eg. INBOX or sub.mailbox.
 #acl = vfile:/etc/dovecot-acls

 # Convert plugin. If set, specifies the source storage path which is
 # converted to destination storage (default_mail_env).
 #convert_mail = mbox:%h/mail

 # Trash plugin. When saving a message would make user go over quota, this
 # plugin automatically deletes the oldest mails from configured mailboxes
 # until the message can be saved within quota limits. The configuration file
 # is a text file where each line is in format: <priority> <mailbox name>
 # Mails are first deleted in lowest -> highest priority number order
 #trash = /etc/dovecot-trash.conf
 }
　
　 　
　 　
◆ dovecotの起動
　 　
　 dovecotの起動です。

下記のように入力して下さい。赤文字は説明です。青文字が入力文字です。
　 　
　  
 [root@linux]# /etc/rc.d/init.d/dovecot start    ← 入力 （dovecot の起動）
 dovecot を起動中: 　　　　　　　　　　[ OK ]
　
　 　
　 続いてＰＣの再起動に SMTP-Auth を自動的に起動するようにします。下記のように入力します。青文字が入力文字です。
　 　
　  
 [root@linux]# chkconfig dovecot on      ← chkconfig dovecot on を入力（dovecot の自動起動）
 
　 　
　 自動起動設定の確認。下記のように入力し 、下記のように表示されればＯＫです。青文字が入力文字です。
　 　
　  
 [root@linux]# chkconfig --list dovecot      ← chkconfig --list dovecot を入力（dovecot の自動起動確認）
 dovecot       0:off   1:off   2:on   3:on   4:on   5:on   6:off
　
　 　
　 再起動は下記のように入力します。青文字が入力文字です。
　 　
　  
 [root@linux]# /etc/rc.d/init.d/dovecot restart
 
　 　
　 　

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