昨天服务器意外断电了一次，今天发现，外部邮件收发均出现了问题，请高手帮忙解决
具体情况为：系统内互发邮件没有问题，但是接收和发送外部邮件都不成功，maillog如下：
Jun  5 04:04:51 mail postfix/pickup[9092]: 3A85A7E07EA: uid=0 from=<root>
Jun  5 04:04:51 mail postfix/cleanup[10128]: 3A85A7E07EA: message-id=<20090604200451.3A85A7E07EA@mail.dcsng.com>
Jun  5 04:04:51 mail postfix/qmgr[2323]: 3A85A7E07EA: from=<root@mail.dcsng.com>, size=692, nrcpt=1 (queue active)
Jun  5 04:04:51 mail postfix/cleanup[10128]: 4AF4D7E07E9: message-id=<20090604200451.3A85A7E07EA@mail.dcsng.com>
Jun  5 04:04:51 mail postfix/qmgr[2323]: 4AF4D7E07E9: from=<root@mail.dcsng.com>, size=823, nrcpt=1 (queue active)
Jun  5 04:04:51 mail postfix/local[10130]: 3A85A7E07EA: to=<root@mail.dcsng.com>, relay=local, delay=3.9, delays=3.8/0.05/0/0.01, dsn=2.0.0, status=sent (forwarded as 4AF4D7E07E9)
Jun  5 04:04:51 mail postfix/qmgr[2323]: 3A85A7E07EA: removed
Jun  5 04:04:51 mail postfix/pipe[10131]: 4AF4D7E07E9: to=<postmaster@dcsng.com>, relay=dovecot, delay=0.04, delays=0.01/0.01/0/0.02, dsn=2.0.0, status=sent (delivered via dovecot service)
Jun  5 04:04:51 mail postfix/qmgr[2323]: 4AF4D7E07E9: removed
Jun  5 04:08:26 mail postfix/qmgr[2323]: AEA097E07E4: from=<mail@ctocio.com.cn>, size=28359, nrcpt=1 (queue active)
Jun  5 04:08:26 mail postfix/smtp[10154]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Jun  4 20:08:26 mail postfix/smtp[10154]: AEA097E07E4: to=<sonic@dcsng.com>, relay=none, delay=55086, delays=55086/0.01/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Jun  5 04:23:26 mail postfix/qmgr[2323]: B4F23AB0001: from=<bettyshan@kesselchina.com>, size=101149, nrcpt=1 (queue active)
Jun  5 04:23:26 mail postfix/smtp[10238]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Jun  4 20:23:26 mail postfix/smtp[10238]: B4F23AB0001: to=<Eric.Davis@kessel.de>, relay=none, delay=42380, delays=42380/0.01/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Jun  5 04:28:26 mail postfix/qmgr[2323]: DBC5E7E07D9: from=<liuyuan79@gmail.com>, size=5632872, nrcpt=1 (queue active)
Jun  5 04:28:26 mail postfix/qmgr[2323]: E53907E07DC: from=<gs-1997@tom.com>, size=2171, nrcpt=1 (queue active)
Jun  5 04:28:26 mail postfix/smtp[10265]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Jun  5 04:28:26 mail postfix/smtp[10266]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Jun  4 20:28:26 mail postfix/smtp[10266]: E53907E07DC: to=<sonic@dcsng.com>, relay=none, delay=59186, delays=59186/0.02/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Jun  4 20:28:26 mail postfix/smtp[10265]: DBC5E7E07D9: to=<sonic@dcsng.com>, relay=none, delay=33996, delays=33996/0.01/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
Jun  5 04:33:26 mail postfix/qmgr[2323]: E17EE7E07E0: from=<bettyshan@kesselchina.com>, size=10388, nrcpt=1 (queue active)
Jun  5 04:33:26 mail postfix/smtp[10295]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused
Jun  4 20:33:26 mail postfix/smtp[10295]: E17EE7E07E0: to=<lucy-xie@263.net>, relay=none, delay=54953, delays=54953/0.01/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)