我已经使用 postfix 和 dovecot 建立了一个邮件服务器：mail.milovanovic.nl。它运行良好（发送和接收），除了我无法从某些服务接收邮件，如 Reddit 和 Firefox（确认邮件以获取 Firefox 帐户）。到目前为止，它可以毫无问题地接收来自大多数服务的邮件。
我的问题是，这是什么原因造成的，我该如何解决？
抱歉，我不知道还需要包含哪些其他信息。
编辑：我的 mail.log 的最新部分
Dec 30 12:23:44 milovanovic postfix/smtpd[20815]: connect from unknown[45.142.120.166]
Dec 30 12:23:44 milovanovic postfix/smtpd[20458]: warning: unknown[141.98.10.136]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Dec 30 12:23:44 milovanovic postfix/smtpd[20458]: disconnect from unknown[141.98.10.136] ehlo=1 auth=0/1 quit=1 commands=2/3
Dec 30 12:23:44 milovanovic postfix/smtpd[21309]: disconnect from unknown[212.70.149.85] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Dec 30 12:23:48 milovanovic postfix/smtpd[20504]: connect from unknown[212.70.149.54]
Dec 30 12:23:49 milovanovic postfix/smtpd[20465]: connect from unknown[45.142.120.166]
Dec 30 12:23:50 milovanovic postfix/smtpd[20336]: warning: unknown[45.142.120.166]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Dec 30 12:23:50 milovanovic postfix/smtpd[20336]: disconnect from unknown[45.142.120.166] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Dec 30 12:23:51 milovanovic postfix/smtpd[21804]: warning: unknown[45.142.120.166]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Dec 30 12:23:51 milovanovic postfix/smtpd[21804]: disconnect from unknown[45.142.120.166] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Dec 30 12:23:51 milovanovic postfix/smtpd[20553]: connect from unknown[212.70.149.85]
Dec 30 12:23:54 milovanovic postfix/smtpd[21894]: connect from unknown[45.142.120.166]
Dec 30 12:23:57 milovanovic dovecot: auth: Warning: auth client 0 disconnected with 1 pending requests: Connection reset by peer
Dec 30 12:23:58 milovanovic postfix/anvil[12765]: statistics: max connection rate 14/60s for (smtp:45.142.120.166) at Dec 30 12:19:16
Dec 30 12:23:58 milovanovic postfix/anvil[12765]: statistics: max connection count 4 for (smtp:45.142.120.166) at Dec 30 12:14:18
Dec 30 12:23:58 milovanovic postfix/anvil[12765]: statistics: max cache size 15 at Dec 30 12:19:43
Dec 30 12:23:58 milovanovic postfix/smtpd[21309]: connect from unknown[45.142.120.166]
Dec 30 12:23:59 milovanovic postfix/smtpd[20815]: warning: unknown[45.142.120.166]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Dec 30 12:23:59 milovanovic postfix/smtpd[20504]: warning: unknown[212.70.149.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Dec 30 12:23:59 milovanovic postfix/smtpd[20815]: disconnect from unknown[45.142.120.166] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Dec 30 12:23:59 milovanovic postfix/smtpd[20465]: warning: unknown[45.142.120.166]: SASL LOGIN authentication failed: Connection lost to authentication server
Dec 30 12:23:59 milovanovic postfix/smtpd[20465]: disconnect from unknown[45.142.120.166] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Dec 30 12:24:00 milovanovic postfix/smtpd[20504]: disconnect from unknown[212.70.149.54] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Dec 30 12:24:03 milovanovic postfix/smtpd[21804]: connect from unknown[45.142.120.166]
Dec 30 12:24:05 milovanovic postfix/smtpd[20553]: warning: unknown[212.70.149.85]: SASL LOGIN authentication failed: UGFzc3d
答案 0 :(得分：0)
我前段时间发现了我的问题。我盲目地遵循了 DMARC 的教程，结果发现在该教程中，他们只是将策略设置为拒绝未经身份验证的邮件。因此，Reddit 和 Firefox 邮件被拒绝。
我改变了政策，不拒绝他们，瞧，没有更多的拒绝。