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Sendmail 不发送电子邮件

tag-icon • tag-icon linux apache-2.2 sendmail reverse-dns
Sendmail 不发送电子邮件

我从前任那里继承的 Apache 服务器不发送电子邮件。当服务器上托管的 Web 应用程序需要发送电子邮件时，它会在尝试发送电子邮件时阻止所有其他进程（让用户觉得它已冻结），直到失败。

我发出了以下命令（用有效的电子邮件地址替换 MY_EMAIL）：

sendmail -vvv MY_EMAIL < email.txt

在 /var/spool/mail/root 中记录了以下内容

<MY_EMAIL>... Connecting to [127.0.0.1] via relay...
220 localhost.localdomain ESMTP Sendmail 8.13.8/8.13.8; Tue, 23 Feb 2016 10:10:47 GMT
>>> EHLO localhost.localdomain
250-localhost.localdomain Hello localhost.localdomain [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH DIGEST-MD5 CRAM-MD5
250-DELIVERBY
250 HELP
>>> MAIL From:<[email protected]> SIZE=53 [email protected]
250 2.1.0 <[email protected]>... Sender ok
>>> RCPT To:<MY_EMAIL>
>>> DATA
250 2.1.5 <MY_EMAIL>... Recipient ok (will queue)
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 u1NAAljf028766 Message accepted for delivery
<MY_EMAIL>... Sent (u1NAAljf028766 Message accepted for delivery)
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 localhost.localdomain closing connection

我对此没有太多经验，这个日志文件有什么问题吗？

当我发出命令时：mailq我刚刚尝试发送的电子邮件已添加到队列中：

                 /var/spool/mqueue (6 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------

u1NA3bgF028698       32 Tue Feb 23 10:04 <[email protected]>
                 (host map: lookup (<DOMAIN>): deferred)
                                         <MY_EMAIL>
u1NAAljf028766       32 Tue Feb 23 10:12 <[email protected]>
                 (host map: lookup (<DOMAIN>): deferred)
                                         <MY_EMAIL>
u1N9O9Kx027456     2007 Tue Feb 23 09:25 <[email protected]>
                 (host map: lookup (<DOMAIN>): deferred)
                                         <MY_EMAIL>
u1IEBMEa015156     1321 Thu Feb 18 14:12 <[email protected]>
                 (host map: lookup (<DOMAIN>): deferred)
                                         <MY_EMAIL>
u1ID5lfY014306     1319 Thu Feb 18 13:07 <[email protected]>
                 (host map: lookup (<DOMAIN>): deferred)
                                         <MY_EMAIL>
                Total requests: 6

这是否(host map: lookup (<DOMAIN>): deferred)意味着这是一个 DNS 问题？

答案1

这绝对看起来像是未配置的服务器。首先，localhost.localdomain这是错误的。本地域部分必须明确定义为真实的东西。其次，sendmail 似乎localhost.localdomain没有将此主机识别为本地可交付主机，可能是因为local-host-names配置文件不包含它。您可以通过查看该文件并发出

sendmail -bv [email protected]

命令。日志中包含更多信息，请使用

grep u1NAAljf028766 /var/log/mailllog。

无论如何，从配置 /etc/hosts 开始。

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