原文地址：http://blog.sina.com.cn/s/blog_4a06a1ec0100gt4l.html
今天尝试着想要在linux终端上直接用mail命令（e.g: echo "hello" | mail -s "hello test" xxx@139.com）给我139.com的邮箱发邮件时，139.com邮箱根本收不到，但是总是可以在/var/mail/root下面找到我刚才发的邮件，其实这是因为发送失败了，从而被sendmail回退了邮件回来。
要想看失败原因, check /var/log/maillog：
Aug 1 18:41:40 localhost sendmail[5279]: o71Afeih005279: from=root, size=220, class=0, nrcpts=1, msgid=<201008011041.o71Afeih005279@localhost.localdomain>, relay=root@localhost
Aug 1 18:41:42 localhost sendmail[5281]: o71Afekr005281: from=, size=480, class=0, nrcpts=1, msgid=<201008011041.o71Afeih005279@localhost.localdomain>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
Aug 1 18:41:42 localhost sendmail[5279]: o71Afeih005279: to=favorite214@139.com, ctladdr=root (0/0), delay=00:00:02, xdelay=00:00:02, mailer=relay, pri=30220, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (o71Afekr005281 Message accepted for delivery)
Aug 1 18:41:44 localhost sendmail[5283]: o71Afekr005281: to=, ctladdr= (0/0), delay=00:00:03, xdelay=00:00:02, mailer=esmtp, pri=120480, relay=mx.139.com. [221.176.6.96], dsn=5.0.0, stat=Service unavailable
Aug 1 18:41:44 localhost sendmail[5283]: o71Afekr005281: o71Afikr005283: DSN: Service unavailable
Aug 1 18:41:44 localhost sendmail[5283]: o71Afikr005283: to=, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31717, dsn=2.0.0, stat=Sent
后来在google上找了很多，最后终于找到原因了：
I fixed the problem by changing the hostname of my server. Apparently "localhost.localdomain" will get rejected automatically by a lot of mail servers. As soon as I changed my hostname to "extra.idahostatesman.com" (a domain that is hosted on the server), everything just worked and I had no more problems sending e-mail.
可以用hostanme 命令临时修改主机名，hostname aa.com; 还是失败了
Aug 1 19:11:33 localhost sendmail[5579]: o71BBVB9005579: from=root, size=221, class=0, nrcpts=1, msgid=<201008011111.o71BBVB9005579@aa.com>, relay=root@localhost
Aug 1 19:11:35 localhost sendmail[5580]: o71BBX3b005580: from=, size=436, class=0, nrcpts=1, msgid=<201008011111.o71BBVB9005579@aa.com>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
Aug 1 19:11:35 localhost sendmail[5579]: o71BBVB9005579: to=favorite214@139.com, ctladdr=root (0/0), delay=00:00:04, xdelay=00:00:02, mailer=relay, pri=30221, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (o71BBX3b005580 Message accepted for delivery)
Aug 1 19:11:39 localhost sendmail[5582]: o71BBX3b005580: to=, delay=00:00:04, xdelay=00:00:04, mailer=esmtp, pri=120436, relay=mx.139.com. [221.176.6.96], dsn=4.0.0, stat=Deferred: 450 Requested action not taken:cmmx01, AS0QrJA75wiRVlVMWIvlAA--.3152S2, dynamic, reputation, zen.spamhaus.org, please try again
切记：修改完hostname以后需要重启sendmail 服务，重启服务后，一切ok.
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