linux sendmail 服务器建立以后。使用telnet能够登录，但是outlook不能登录
outlook： 登录邮件服务器时出错。“用户名”被拒绝。 帐户: 'mail.qiaorong.com', 服务器:
'mail.qiaorong.com', 协议: POP3, 服务器响应: '-ERR Plaintext
authentication disallowed on non-secure (SSL/TLS) connections.',
端口: 110, 安全(SSL): 否, 服务器错误: 0x800CCC90, 错误号: 0x800CCC91
/var/log/maillog 日志如下：
Oct 28 08:52:54 qiaorong dovecot: imap(qiaorong): Error: user
qiaorong: Initialization failed: mail_location not set and
autodetection failed: Mail storage autodetection failed with
home=/home/qiaorong
Oct 28 08:52:54 qiaorong dovecot: imap(qiaorong): Error: Invalid
user settings. Refer to server log for more information.
Oct 28 08:54:23 qiaorong dovecot: master: Warning: Killed with
signal 15 (by pid=1455 uid=0 code=kill)
Oct 28 08:54:24 qiaorong dovecot: master: Dovecot v2.0.beta6
(3156315704ef) starting up (core dumps disabled)
Oct 28 08:57:43 qiaorong dovecot: imap-login: Disconnected:
Inactivity (tried to use disabled plaintext auth):
rip=192.168.1.21, lip=192.168.1.16, mpid=0
Oct 28 09:00:33 qiaorong dovecot: imap-login: Disconnected (no auth
attempts): rip=192.168.1.21, lip=192.168.1.16, mpid=0
Oct 28 09:27:24 qiaorong dovecot: pop3-login: Disconnected (tried
to use disabled plaintext auth): rip=192.168.1.21,
lip=192.168.1.16, mpid=0
Oct 28 09:27:26 qiaorong dovecot: pop3-login: Disconnected (tried
to use disabled plaintext auth): rip=192.168.1.21,
lip=192.168.1.16, mpid=0
解决方法:
唉。整了这么多天终于自己整出来了，欣欣然。这个问题主要原因是mail_location not set and
autodetection failed 两个问题
关于第一个mail_location
，在/etc/dovecot/conf.d目录下有一个10-mail.conf的文件。内容如下：
# 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
取消注释
关于第二个问题。还是dovecot的问题，找到/etc/dovecot/dovecot.conf 文档，编辑里面的内容
protocols = imap pop3 lmtp
disable_plaintext_auth=no
ssl_disable = no
取消注释，并添加你的文件中或许没有的内容。
2014-07-13 20:33:19