postfix收邮件出问题求大神指点

xafei011

我直接往 dovecot用户发邮件补弹回
ay  9 11:45:53 test postfix/cleanup[2048]: 68100837FB: message-id=<20140509034547.68100837FB@mail.xxx.com>
May  9 11:45:53 test postfix/qmgr[2041]: 68100837FB: from=<lll@xxxcom>, size=334, nrcpt=1 (queue active)
May  9 11:45:53 test postfix/smtp[2049]: 68100837FB: to=<dovecot@xxx.com>, relay=none, delay=20, delays=20/0.01/0/0, dsn=5.4.6, status=bounced (mail for meloon.com loops back to myself)
May  9 11:45:53 test postfix/cleanup[2048]: 49B2F8380B: message-id=<20140509034553.49B2F8380B@mail.xxx.com>
May  9 11:45:53 test postfix/qmgr[2041]: 49B2F8380B: from=<>, size=2109, nrcpt=1 (queue active)
May  9 11:45:53 test postfix/bounce[2050]: 68100837FB: sender non-delivery notification: 49B2F8380B
May  9 11:45:53 test postfix/qmgr[2041]: 68100837FB: removed
May  9 11:45:53 test postfix/smtp[2049]: 49B2F8380B: to=<lll@xxx.com>, relay=none, delay=0.01, delays=0/0/0/0, dsn=5.4.6, status=bounced (mail for meloon.com loops back to myself)
May  9 11:45:53 test postfix/qmgr[2041]: 49B2F8380B: removed
May  9 11:45:56 test postfix/smtpd[2043]: disconnect from unknown[192.168.1.182]

我在 mydestination里面把 $mydomain加进去了，不管你的邮件是发往哪个用户的都。。。直接发到root用户去了。这是什么原因呀
我的postfix 是postfix-2.11.0的