# Protocols we want to be serving:
protocols = imap imaps pop3 pop3s　←#を取る

dovecot1.0 以前の場合
メールボックス(Maildir)を各ユーザのホームディレクトリに配置
# Default MAIL environment to use when it's not set. By leaving this empty
# dovecot tries to do some automatic detection as described in
# doc/mail-storages.txt. There's a few special variables you can use:
#
# %u - username
# %n - user part in user@domain, same as %u if there's no domain
# %d - domain part in user@domain, empty if user there's no domain
# %h - home directory
#
# You can also limit a width of string by giving the number of max. characters
# after the '%' character. For example %1u gives the first character of
# username. Some examples:
#
# maildir:/var/mail/%1u/%u/Maildir
# mbox:~/mail/:INBOX=/var/mail/%u
# mbox:/var/mail/%d/%n/:INDEX=/var/indexes/%d/%n
#
default_mail_env = maildir:~/Maildir　←#を取って追加（メールボックスをMaildir形式とする）


dovecot1.0-1 以降の場合
# 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/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
#
# http://wiki.dovecot.org/MailLocation
#
mail_location = maildir:~/Maildir　←#を取って追加


Sendmail の特性上MTAでメールが配送されるためにMDAで配送するには向いていないので、
Sendmail で Maildir を使うにはMDAで正しく配送されるようにします。
そこで sendmail.mc ファイルの適切な位置に FEATURE(`local_procmail') を書いて上げる必要があります。
RedHat Linux、FedoraCore の標準設定ではMDAに procmail を使うようにはじめから設定されていますのでまったくいじる必要もありません。
/etc/procmailrcファイルをMaildirにすればOKです。
以下のように新しくファイルを作成します。
[root@root ~]# vi /etc/procmailrc

SHELL=/bin/bash
PATH=/usr/bin:/bin
DROPPRIVS=yes
MAILDIR=$HOME/Maildir
DEFAULT=$MAILDIR/
#LOGFILE=$HOME/procmail.log
# ログ出力先 #VERBOSE=ON # 詳細ログ出力


chrootユーザのディレクトリの場合
# ':' 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 = /home　←#を取って追加（OpenSSH+Chrootを導入している場合）