Linux SendMail发送邮件失败诊断案例(二)-阿里云开发者社区

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Linux SendMail发送邮件失败诊断案例(二)

简介:

Linux上Sendmail经常由于一些配置问题,导致邮件发送失败,下面整理、收集了一些邮件发送失败、异常的案例。


案例1:在新服务器上测试sendmail发送邮件时,发现邮件发送不成功,检查/var/log/maillog日志文件发现如下错误(Notice:hostname、邮箱地址等信息使用xxx代替)

 


tail /var/log/maillog


May 15 09:43:38 xxxxx sendmail[9182]: s4F1hcQe009182: from=root, size=58269, class=0, nrcpts=1, msgid=<201405150143.s4F1hcQe009182@xxxx>, relay=root@localhost
May 15 09:43:38 xxxxx sendmail[9182]: s4F1hcQe009182: to=konglb@xxxx, delay=00:00:00, mailer=esmtp, pri=88269, dsn=4.4.3, stat=queued
May 15 09:43:58 xxxxx sendmail[9186]: NOQUEUE: SYSERR(oracle): can not chdir(/var/spool/mqueue/): Permission denied


出现这个问题,是因为oracle账号没有权限访问/var/spool/mqueue,需要授予相关权限,如下所示:

chmod 755 /var/spool/mqueue


案例2:查看var/log/maillog日志文件发现如下错误

 


May 15 10:21:41 xxxxx sendmail[9850]: s4F2LfrT009850: to=<konglb@xxxx>, delay=00:00:00, mailer=esmtp, pri=37549, dsn=4.4.3, stat=queued


出现这个问题是因为dns server不正确设置导致,需要修改/etc/resolv.conf 下的nameserver值。

 

案例3:检查/var/log/maillog发现如下信息,邮件状态为Sent(stat=Sent),但是依然没有收到邮件。

[root@DB-Server mail]# tail /var/log/maillog

Dec 18 11:15:01 nbolnx01 sendmail[25312]: sBI3F18J025312: from=<oracle@xxxx.xxxx>, size=607, class=0, nrcpts=1, msgid=<201412180315.sBI3F12b025302@nbolnx01.xxxx.xxxx>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Dec 18 11:15:01 nbolnx01 sendmail[25302]: sBI3F12b025302: to=oracle, ctladdr=oracle (502/502), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30290, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (sBI3F18J025312 Message accepted for delivery)
Dec 18 11:15:01 nbolnx01 sendmail[25327]: sBI3F1mw025327: from=<oracle@xxxx.xxxx>, size=599, class=0, nrcpts=1, msgid=<201412180315.sBI3F1Ba025321@xxxx.xxxx>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Dec 18 11:15:01 nbolnx01 sendmail[25321]: sBI3F1Ba025321: to=oracle, ctladdr=oracle (502/502), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30282, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (sBI3F1mw025327 Message accepted for delivery)

检查mailq,如下所示,发现大量邮件处于等待发送的队列


[root@DB-Server mail]# mailq
.................................................................
.................................................................
.................................................................
sBD2j1tq000440      214 Sat Dec 13 10:45 <oracle@xxxx.xxxx>
                 (host map: lookup (xxxx.com): deferred)
                                         konglb@xxxx.com
sBD301x9000637      214 Sat Dec 13 11:00 <oracle@xxxx.xxxx>
                 (host map: lookup (xxxx.com): deferred)
                                         konglb@xxxx.xxxx
                Total requests: 120
[root@nbolnx01 mail]#

 


出現了"host map: lookup (domain): deferred"错误,意味着邮件的发送被延迟了。需要通过修改配置文件/etc/mail/sendmail.cf。找到 #O ResolverOptions=+AAONLY 这一行信息后将注释取消掉,然后重启sendmail服务即可解决问题。

clip_image001

 

[root@DB-Server ~]# service sendmail stop

Shutting down sm-client: [ OK ]

Shutting down sendmail: [ OK ]

[root@DB-Server ~]# service sendmail start

Starting sendmail: [ OK ]

Starting sm-client: [ OK ]

 

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