postfix有些地址无法发送出去

wang509020

我公司里用的是postfix邮件软件来收发邮件,之前都是好好的,现在不知道是什么原因造成无法收到一个供应商的邮件,但是我们发给他没有问题,但是就没有办法收到他的邮件,他发到我私人邮箱都可以的,我不知道是什么原因,请各位帮忙看一下,多谢.
注:下面是此邮件发出去的log:

   Sep  5 11:43:08 cnmail postfix/smtpd[4443]: connect from unknown[192.168.6.77]
Sep  5 11:43:08 cnmail authdaemond: received auth request, service=smtp, authtype=login
Sep  5 11:43:08 cnmail authdaemond: authmysql: trying this module
Sep  5 11:43:08 cnmail authdaemond: SQL query: SELECT username, password, password, '1001', '1001', '/var/home/vmail', CONCAT
('/var/home/vmail/',maildir), CONCAT(quota,'S'), name, "" FROM mailbox WHERE username = 'pur1@example.com'
Sep  5 11:43:08 cnmail authdaemond: password matches successfully
Sep  5 11:43:08 cnmail authdaemond: authmysql: sysusername=<null>, sysuserid=1001, sysgroupid=1001, homedir=/var/home/vmail,
address=pur1@example.com, fullname=???, maildir=/var/home/vmail/example.com/pur1/, quota=1024000000S, options=<null>
Sep  5 11:43:08 cnmail authdaemond: Authenticated: sysusername=<null>, sysuserid=1001, sysgroupid=1001, homedir=/var/home/vma
il, address=pur1@example.com, fullname=???, maildir=/var/home/vmail/example.com/pur1/, quota=1024000000S, options=<nu
ll>
Sep  5 11:43:08 cnmail postfix/smtpd[4443]: 5523C5FED93: client=unknown[192.168.6.77], sasl_method=PLAIN, sasl_username=pur1@
precisionhk.com
Sep  5 11:43:08 cnmail postfix/cleanup[4449]: 5523C5FED93: hold: header Received: from [192.168.6.77] (unknown [192.168.6.77 )??(Authenticated sender: pur1@example.com)??by dg.precisionhk.com (Postfix) with ESMTP id 5523C5FED93;??Mon,  5 Sep 201  11:43:08 +0800 (HKT) from unknown[192.168.6.77]; from=<pur1@example.com> to=<info32@cn-lanxin.com> proto=ESMTP helo=<[1 2.168.6.77]>
Sep  5 11:43:08 cnmail postfix/cleanup[4449]: 5523C5FED93: message-id=<4E644546.7050001@example.com>
Sep  5 11:43:08 cnmail postfix/smtpd[4443]: disconnect from unknown[192.168.6.77]