postfix下装extmail可以登录邮箱但无法发信，紧急求助！！！

noway01

日志如下：（mysql.sock我查了我的配置都是指定到/tmp目录，这里报错不知道哪里出问题）
Dec 24 06:47:49 linux5 postfix/pickup[3730]: DA3D8A818A: uid=0 from=<root>
Dec 24 06:48:00 linux5 postfix/trivial-rewrite[3825]: warning: connect to mysql server localhost: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
Dec 24 06:48:00 linux5 postfix/trivial-rewrite[3825]: fatal: mysql:/etc/postfix/mysql_virtual_alias_maps.cf(0,lock|fold_fix): table lookup problem
Dec 24 06:48:00 linux5 postfix/trivial-rewrite[3826]: warning: connect to mysql server localhost: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
Dec 24 06:48:00 linux5 postfix/trivial-rewrite[3826]: fatal: mysql:/etc/postfix/mysql_virtual_alias_maps.cf(0,lock|fold_fix): table lookup problem
Dec 24 06:48:00 linux5 postfix/cleanup[3732]: DA3D8A818A: message-id=<20091223224749.DA3D8A818A@mail.extmail.org>
Dec 24 06:48:00 linux5 postfix/cleanup[3732]: warning: connect to mysql server localhost: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
Dec 24 06:48:00 linux5 postfix/cleanup[3732]: warning: DA3D8A818A: virtual_alias_maps map lookup problem for root@extmail.org
Dec 24 06:48:01 linux5 postfix/smtpd[3735]: warning: problem talking to service rewrite: Success
Dec 24 06:48:01 linux5 postfix/master[3728]: warning: process /usr/libexec/postfix/trivial-rewrite pid 3825 exit status 1
Dec 24 06:48:01 linux5 postfix/master[3728]: warning: /usr/libexec/postfix/trivial-rewrite: bad command startup -- throttling
Dec 24 06:48:01 linux5 postfix/master[3728]: warning: process /usr/libexec/postfix/trivial-rewrite pid 3826 exit status 1
Dec 24 06:48:01 linux5 postfix/qmgr[3729]: warning: problem talking to service rewrite: Interrupted system call
Dec 24 06:48:02 linux5 postfix/trivial-rewrite[3827]: warning: connect to mysql server localhost: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
Dec 24 06:48:02 linux5 postfix/trivial-rewrite[3827]: fatal: mysql:/etc/postfix/mysql_virtual_alias_maps.cf(0,lock|fold_fix): table lookup problem
Dec 24 06:48:03 linux5 postfix/smtpd[3735]: warning: problem talking to service rewrite: Success
Dec 24 06:48:03 linux5 postfix/master[3728]: warning: process /usr/libexec/postfix/trivial-rewrite pid 3827 exit status 1

noway01

看来是跟前面几位遇到的问题类似啊，有没有人能回答一下到底是怎么回事呢？

noway01

没有另外单独装MDA，应该是postfix集成的吧。
用之前一位大侠的方法，建链接文件搞定了，但不知道什么原因。