CentOS 7
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Dovecot : Install2014/07/21
 
Install Dovecot to configure POP/IMAP server
[1] Install Dovecot.
[root@mail ~]#
yum -y install dovecot
[2] This example shows to configure to provide SASL function to Postfix.
[root@mail ~]#
vi /etc/dovecot/dovecot.conf
# line 24: uncomment

protocols = imap pop3 lmtp
# line 30: uncomment and change ( if not use IPv6 )

listen =
*
[root@mail ~]#
vi /etc/dovecot/conf.d/10-auth.conf
# line 10: uncomment and change ( allow plain text auth )

disable_plaintext_auth =
no
# line 100: add

auth_mechanisms = plain
login
[root@mail ~]#
vi /etc/dovecot/conf.d/10-mail.conf
# line 30: uncomment and add

mail_location =
maildir:~/Maildir
[root@mail ~]#
vi /etc/dovecot/conf.d/10-master.conf
# line 96-98: uncomment and add like follows

# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth {
    mode = 0666
    user = postfix
    group = postfix
}
[root@mail ~]#
vi /etc/dovecot/conf.d/10-ssl.conf
# line 8: change (not require SSL)

ssl =
no
[root@mail ~]#
systemctl start dovecot

[root@mail ~]#
systemctl enable dovecot

[3] If Firewalld is running, allow POP/IMAP services. POP uses 110/TCP, IMAP uses 143/TCP.
[root@dlp ~]#
firewall-cmd --add-service={pop3,imap} --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
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