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Sendmail：DSN：服务不可用

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Sendmail：DSN：服务不可用

我一直无法让服务器发送电子邮件，我怎么也想不出解决办法。如果有人能给我一些简单的建议，我将不胜感激！

May 19 15:36:03 ubuntu-12 sm-mta[2484]: s4JFa3jp002484: from=<[email protected]     production>, size=412, class=0, nrcpts=1, msgid=<[email protected]  production>, proto=ESMTP, daemon=MTA-v4, relay=ip6-localhost [127.0.0.1]
May 19 15:36:03 ubuntu-12 sendmail[2483]: s4JFZw4c002483: [email protected], ctladdr=www-data (33/33), delay=00:00:05, xdelay=00:00:05, mailer=relay, pri=30123, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (s4JFa3jp002484 Message accepted for delivery)
May 19 15:36:03 ubuntu-12 sm-mta[2487]: s4JFa3jp002484: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=120412, relay=mailserver.mycompany.com. [213.171.216.115], dsn=5.0.0, stat=Service unavaila$
May 19 15:36:03 ubuntu-12 sm-mta[2487]: s4JFa3jp002484: s4JFa3jp002487: DSN: Service unavailable
May 19 15:36:03 ubuntu-12 sm-mta[2487]: s4JFa3jp002487: to=<[email protected]>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30000, dsn=2.0.0, stat=Sent

答案1

该输出的第三行告诉我，发送服务器工作正常，但接收服务器“mailserver.mycompany.com”未监听传入邮件。服务已关闭或未监听外部地址。

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