已解决 - Postfix SMTP 端口 Stange 活动

您好 ServerFault 社区，

我有一个基于 MySQL 的 Postfix 和 Dovecot 邮件服务器，我遇到了 MySQL 的问题，所以我不得不重新安装它，这就是问题开始发生的地方。

RoundCube 启动器随机给我（只是几次）IMAP 服务器连接错误。有时他说他无法加载电子邮件，因为他无法连接到 IMAP，我必须重新加载页面才能使其再次工作。假设它发生了 50% 的时间。

但这不是主要问题，只是使用起来很无聊。

今天我的 SMTP 服务器开始做一些奇怪的事情。让我解释。

我的 SMTP 和 IMAP 突然停止工作。我可以通过编辑 VPS 的名称服务器来修复 IMAP，这会导致传入邮件的 DNS 解析出现问题。但 SMTP 仍然工作了一半。

SMTP 工作：

In localhost,
By doing telnet port 25 in localhost,
By doing telnet 587 also from other IPs,
With Apple's Mail Client and not PHP Mail clients. (Ports 25 and 587),
NON-PhP Mailer (I tried with www(.)gmass(.)co/smtp-test) On all the ports (25,465,587).

SMTP 不起作用：

With PHP Mailer (I tried with WHMCS (Main Issue) and www(.)smtper(.)net) ,WHMCS any port SMTPER works on 25,
Telnet to 465 Localhost and non,
Telnet port 25 from external hosts,
By doing telnet port 25 from external hosts (I tryed with Putty).

我确信这不是 99.9999% 的防火墙问题，因为即使禁用 iPTables 我也有同样的问题。要解决的主要问题是 PHPMailers 不工作，如 WHMCS。

我的 IPTables，你可以看到端口是打开的，也是因为我可以将它们与一些 SMTP 客户端一起使用：

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
f2b-sshd   tcp  --  anywhere             anywhere             multiport dports 2233
ACCEPT     udp  --  anywhere             anywhere             udp dpt:465
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:urd
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:smtp
f2b-sshd   tcp  --  anywhere             anywhere             multiport dports 2233
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3s
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3
f2b-sshd   tcp  --  anywhere             anywhere             multiport dports 2233
ACCEPT     udp  --  anywhere             anywhere             udp dpt:11334
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:11334
ACCEPT     udp  --  anywhere             anywhere             udp dpt:19999
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:19999
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:32400
ACCEPT     udp  --  anywhere             anywhere             udp dpt:32400
ACCEPT     udp  --  anywhere             anywhere             udp dpt:8888
ACCEPT     udp  --  anywhere             anywhere             udp dpt:8096
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:8096
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:8888
ACCEPT     udp  --  anywhere             anywhere             udp dpt:50315
ACCEPT     all  --  anywhere             anywhere
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:webmin
ACCEPT     udp  --  anywhere             anywhere             udp dpt:10000
f2b-sshd   tcp  --  anywhere             anywhere             multiport dports 2233
ACCEPT     udp  --  anywhere             anywhere             udp dpt:10040
ACCEPT     udp  --  anywhere             anywhere             udp dpt:10023
ACCEPT     udp  --  anywhere             anywhere             udp dpt:11332
ACCEPT     udp  --  anywhere             anywhere             udp dpt:mysql
ACCEPT     udp  --  anywhere             anywhere             udp dpt:110
ACCEPT     udp  --  anywhere             anywhere             udp dpt:100
ACCEPT     udp  --  anywhere             anywhere             udp dpt:domain
ACCEPT     udp  --  anywhere             anywhere             udp dpt:20
ACCEPT     udp  --  anywhere             anywhere             udp dpt:993
ACCEPT     udp  --  anywhere             anywhere             udp dpt:143
ACCEPT     udp  --  anywhere             anywhere             udp dpt:2233
ACCEPT     udp  --  anywhere             anywhere             udp dpt:465
ACCEPT     udp  --  anywhere             anywhere             udp dpt:587
ACCEPT     udp  --  anywhere             anywhere             udp dpt:1988
ACCEPT     udp  --  anywhere             anywhere             udp dpt:http-alt
ACCEPT     udp  --  anywhere             anywhere             udp dpt:22
ACCEPT     udp  --  anywhere             anywhere             udp dpt:25
ACCEPT     udp  --  anywhere             anywhere             udp dpt:80
ACCEPT     udp  --  anywhere             anywhere             udp dpt:443
ACCEPT     udp  --  anywhere             anywhere             udp dpt:2233
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:10040
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:10023
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:11332
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:mysql
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:100
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ftp-data
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:imaps
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:imap2
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:2233
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:urd
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:submission
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:1988
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http-alt
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ssh
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:smtp
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:https
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:2233
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED
DROP       all  --  anywhere             anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED

Chain f2b-sshd (4 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere
RETURN     all  --  anywhere             anywhere
RETURN     all  --  anywhere             anywhere
RETURN     all  --  anywhere             anywhere

感谢您给我的任何帮助。再见！

PS：在几周前的 MySQL 编辑之前，即使使用基于 PHP 的邮件客户端，一切都运行良好，但我不知道这是否是邮件主机或 PHP 主机（WHMCS 和 SMTPER）的问题，就像某些网站和 SMTP 一样客户一切正常。例如 Apple 的电子邮件。

编辑：我在控制台中也有 Postfix 垃圾邮件：

Oct 30 11:06:07 mail.indst.eu systemd[1]: Starting Postfix Mail Transport Agent...
Oct 30 11:06:07 mail.indst.eu systemd[1]: Started Postfix Mail Transport Agent.
Oct 30 11:06:07 mail.indst.eu systemd[1]: Reloading Postfix Mail Transport Agent.
Oct 30 11:06:07 mail.indst.eu systemd[1]: Reloaded Postfix Mail Transport Agent.
Oct 30 11:06:07 mail.indst.eu systemd[1]: Reloading Postfix Mail Transport Agent.
Oct 30 11:06:07 mail.indst.eu systemd[1]: Reloaded Postfix Mail Transport Agent.