Sep 16 23:23:04 redhat postfix/local: 2F5253F9B2: to=<postmaster@test.com>, orig_to=<postmaster>, relay=local, delay=301, delays=300/0.15/0/0.13, dsn=4.3.0, status=deferred (alias database unavailable)
Sep 16 23:28:04 redhat postfix/qmgr: 4C1DE3F565: from=<double-bounce@mail.test.com>, size=694, nrcpt=1 (queue active)
Sep 16 23:28:04 redhat postfix/qmgr: 2F5253F9B2: from=<double-bounce@mail.test.com>, size=721, nrcpt=1 (queue active)
Sep 16 23:28:04 redhat postfix/trivial-rewrite: warning: do not list domain test.com in BOTH mydestination and virtual_mailbox_domains
Sep 16 23:28:04 redhat postfix/local: warning: lookup owner-postmaster, NIS domain test, map mail.aliases: internal yp server or client error
Sep 16 23:28:04 redhat postfix/local: warning: lookup owner-postmaster, NIS domain test, map mail.aliases: internal yp server or client error
Sep 16 23:28:04 redhat postfix/local: 2F5253F9B2: to=<postmaster@test.com>, orig_to=<postmaster>, relay=local, delay=601, delays=600/0.1/0/0.1, dsn=4.3.0, status=deferred (alias database unavailable)
Sep 16 23:28:04 redhat postfix/local: 4C1DE3F565: to=<postmaster@mail.test.com>, orig_to=<postmaster>, relay=local, delay=1017, delays=1016/0.13/0/0.16, dsn=4.3.0, status=deferred (alias database unavailable)
Sep 16 23:28:38 redhat postfix/postfix-script: refreshing the Postfix mail system
Sep 16 23:28:38 redhat postfix/master: reload configuration /etc/postfix
telnet localhost 25成功，
telnet localhost 110 失败，提示 chdir maildir failed
在 extmail 上不能可以发邮件，但不能收。
在 outlook 上不能收发邮件，在 outlook 上无论是开启认证和不开启 论证都不行
还请 marion 兄帮小弟看一下，谢谢啦:)
哦，对了，配置完全是按照你所提供的方法做的，所以配置文件我就不贴了。
而且我用 mailq 命令查看邮件队列，可以看到队列里有邮件，就是没有发出去，郁闷。
Sep 16 23:28:04 redhat postfix/local: 4C1DE3F565: to=<postmaster@mail.test.com>, orig_to=<postmaster>, relay=local, delay=1017, delays=1016/0.13/0/0.16, dsn=4.3.0, status=deferred (alias database unavailable)
Sep 16 23:28:38 redhat postfix/postfix-script: refreshing the Postfix mail system
Sep 16 23:28:38 redhat postfix/master: reload configuration /etc/postfix
别名文件找不到,你是否执行了newaliases命令?
或者查看一下你指定的路径是否正确。
telnet localhost 110 失败，提示 chdir maildir failed
这个应该是你的设置没有权限访问邮箱所在的目录，请检查一下你指定的访问者，以及权限设置。
在 extmail 上不能可以发邮件，但不能收。
这个原因跟上述问题应该是同一个原因造成的。你应该把邮箱目录的所有者指定为httpd服务的运行者或者使用suexec，建议你再认真看一下文档，并渐次排查问题。
newaliases 命令是执行了的，也产生了aliases.db 文件
邮箱所在的目录的属主是 用户 postfix
请确信邮箱目录内的文件也属于postfix用户，同时也应该再去检查一下你的别名文件的设置，包括用户别名和域别名文件。
Sep 17 14:22:49 redhat postfix/smtpd: connect from unknown
Sep 17 14:22:49 redhat postfix/smtpd: warning: unknown: SASL LOGIN authentication failed: authentication failure
Sep 17 14:22:49 redhat postfix/smtpd: lost connection after AUTH from unknown
Sep 17 14:22:49 redhat postfix/smtpd: disconnect from unknown
Sep 17 14:22:49 redhat postfix/smtpd: connect from unknown
Sep 17 14:22:49 redhat postfix/smtpd: warning: unknown: SASL LOGIN authentication failed: authentication failure
Sep 17 14:22:49 redhat postfix/smtpd: lost connection after AUTH from unknown
Sep 17 14:22:49 redhat postfix/smtpd: disconnect from unknown
Sep 17 14:22:49 redhat postfix/smtpd: connect from unknown
Sep 17 14:22:49 redhat postfix/smtpd: warning: unknown: SASL LOGIN authentication failed: authentication failure
Sep 17 14:22:49 redhat postfix/smtpd: lost connection after AUTH from unknown
Sep 17 14:22:49 redhat postfix/smtpd: disconnect from unknown
Sep 17 14:22:49 redhat postfix/smtpd: connect from unknown
Sep 17 14:22:49 redhat postfix/smtpd: warning: unknown: SASL LOGIN authentication failed: authentication failure
Sep 17 14:22:49 redhat postfix/smtpd: lost connection after AUTH from unknown
Sep 17 14:22:49 redhat postfix/smtpd: disconnect from unknown
Sep 17 14:24:40 redhat postfix/qmgr: 6A5613F588: from=<test@test.com>, size=506, nrcpt=1 (queue active)
Sep 17 14:24:40 redhat postfix/trivial-rewrite: warning: do not list domain test.com in BOTH mydestination and virtual_mailbox_domains
Sep 17 14:24:40 redhat postfix/local: warning: lookup bob, NIS domain test, map mail.aliases: internal yp server or client error
Sep 17 14:24:40 redhat postfix/local: 6A5613F588: to=<bob@test.com>, relay=local, delay=526, delays=526/0.1/0/0.06, dsn=4.3.0, status=deferred (alias database unavailable)
又仔细看了一下，还是没有发现什么问题？
邮箱目录内的所有文件都属于 postfix