大侠帮我分析一下sendmail日志，盗用发信人地址？

arbor

我中午根本不在办公室，电脑也是休眠了，竟然有人盗用我的名义发邮件。

relay指的是接收邮件的服务器的IP吗？

如何避免？

1. Apr 30 12:09:42 mail sendmail[27980]: i3TBKefJ020398: to=<zhangzhenjin@2003.cn>;, ctladdr=<arbor@ourdomain.cn>; (501/0), delay=16:48:57, xdelay=00:01:00, mailer=esmtp, pri=5161352, relay=2003.cn. [216.168.60.84], dsn=4.0.0, stat=Deferred: Connection timed out with 2003.cn.
   
2. Apr 30 12:10:53 mail sendmail[27980]: i3TBKefJ020398: to=<inet@345.net>;, ctladdr=<arbor@ourdomain.cn>; (501/0), delay=16:50:08, xdelay=00:01:11, mailer=esmtp, pri=5161352, relay=345.net. [63.251.163.112], dsn=4.0.0, stat=Deferred: Connection timed out with 345.net.
   
3. Apr 30 12:10:53 mail sendmail[27980]: i3TBKefJ020398: to=<dj@son.com>;, ctladdr=<arbor@ourdomain.cn>; (501/0), delay=16:50:08, xdelay=00:00:00, mailer=esmtp, pri=5161352, relay=son.com. [216.234.246.149], dsn=4.0.0, stat=Deferred: Connection refused by son.com.
   
4. Apr 30 12:10:53 mail sendmail[27980]: i3TBKefJ020398: to=<lidl163@torn.com>;, ctladdr=<arbor@ourdomain.cn>; (501/0), delay=16:50:08, xdelay=00:00:00, mailer=esmtp, pri=5161352, relay=torn.com. [216.168.224.63], dsn=4.0.0, stat=Deferred: Connection refused by torn.com
   
5. .

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arbor

我知道怎么回事了，是我在论坛里面向各位会员统一发邮件通知，这几个信箱暂时无法传送，系统在自动重试。呵呵