配置dovecot
yum install -y dovecot
a.配置文件：
a. vim /etc/dovecot/dovecot.conf (protocols = imap pop3)
b. vim /etc/dovecot/conf.d/10-auth.conf
(disable_plaintext_auth = no)
c. vim /etc/dovecot/conf.d/10-mail.conf
(mail_location = maildir:~/Maildir)地址要和postfix服务器配置文件中的home_mailbox地址一致
d. vim /etc/dovecot/conf.d/10-ssl.conf
(ssl = yes)
e. vim /etc/pam.d/dovecot (查看pam认证文件)
b.验证：
[root@CentOS6 ~]# telnet localhost 110
Trying ::1…
Connected to localhost.
Escape character is ‘^]’.
+OK Dovecot ready.
user user1
+OK
pass 123
+OK Logged in.
list
+OK 4 messages:
1 472
2 458
3 464
4 464
.
retr 3
+OK 464 octets
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