求救关于postfix不能发信的问题

dayan

大家好，我的POSTFIX发不出去信件，请大家指点，出错信息是：
Jun 11 13:42:40 localhost sendmail[7894]: l5B5ge3J007894: to=huangshaohua@datuu.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30057, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as 3688EC4620D)
Jun 11 13:42:40 localhost postfix/smtpd[7895]: disconnect from localhost.localdomain[127.0.0.1]
Jun 11 13:42:40 localhost postfix/smtp[7900]: 3688EC4620D: to=<huangshaohua@datuu.com>, relay=mx601.now.net.cn[210.22.14.71], delay=0, status=deferred (lost connection with mx601.now.net.cn[210.22.14.71] while receiving the initial SMTP greeting)