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在 Oracle Linux 7.7 中配置 sendmail 通过中继服务器发送邮件

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在 Oracle Linux 7.7 中配置 sendmail 通过中继服务器发送邮件

我正在配置我的服务器以使用中继服务器发送邮件。我在 /etc/mail/sendmail.mc 中进行了以下输入

define(`SMART_HOST', `corprelay.example.com')dnl
MASQUERADE_AS(`example.com')dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl
MASQUERADE_DOMAIN(localhost)dnl
MASQUERADE_DOMAIN(localhost.localdomain)dnl

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

systemctl restart sendmail

我在邮件日志中收到以下错误，并且邮件被推迟：

Sep 28 08:00:51 ve4-fsdb-l-p01 sendmail[3242]: 18SC0pTv003242: from=ram, size=229, class=0, nrcpts=1, msgid=<[email protected]>, relay=ram@localhost
Sep 28 08:00:51 ve4-fsdb-l-p01 sendmail[3243]: 18SC0peL003243: from=<[email protected]>, size=521, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
Sep 28 08:00:51 ve4-fsdb-l-p01 sendmail[3242]: 18SC0pTv003242: [email protected], ctladdr=ram (1011/1011), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30229, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (18SC0peL003243 Message accepted for delivery)
Sep 28 08:05:51 ve4-fsdb-l-p01 sendmail[3245]: 18SC0peL003243: timeout waiting for input from corprelay.example.com. during client greeting
Sep 28 08:05:51 ve4-fsdb-l-p01 sendmail[3245]: 18SC0peL003243: to=<[email protected]>, ctladdr=<[email protected]> (1011/1011), delay=00:05:00, xdelay=00:05:00, mailer=relay, pri=120521, relay=corprelay.example.com. [20.11.7.5], dsn=4.0.0, stat=Deferred: Connection timed out with corprelay.example.com.

注意：IP 和主机名是虚拟的。

感谢致敬

答案1

防火墙阻止了 sendmail 通信。一旦为端口 25 设置了防火墙规则，sendmail 便开始工作。令人惊讶的是，我能够在端口 25 上进行 telnet，但在防火墙允许之前，我无法使用 telnet 发送邮件。

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