I have just installed a new panel. I am using Apache and php on Centos 7. I configured the mail server correctly, it seems that the correct ports are open on the security side.

I use rainloop as webmail. When I do a test on the admin side, it is successful only when I type localhost in the server part. If I type a domain name in the form of mail.example.com or enter the ip address of my server, it will not be successful. It is valid for both imap and smtp. I could not find what the problem was. I want to send an email from an external client and I can't use localhost there. When I use phpmailer it doesn't even error, directly the 503 response code. Anyone have any ideas?

Screenshots:
Localhost: https://prnt.sc/wk01c4
Mail.xxxxx.com: https://prnt.sc/wjzyoo
Security: https://prnt.sc/wjzz7u

Rainloop logs:

[23:31:43.165][2bec056d] IMAP[NOTE]: Start connection to "ssl://mail.xxxxxxxxx.com:993"
[23:31:48.265][2bec056d] IMAP[NOTE]: Connected (unsuccess)
[23:31:48.266][2bec056d] IMAP[NOTICE]: Socket: [2] stream_socket_client(): unable to connect to ssl://mail.xxxxxxxxx.com:993 (Connection timed out)
[23:31:48.266][2bec056d] IMAP[NOTICE]: MailSo\Net\Exceptions\SocketCanNotConnectToHostException: Can't connect to host "ssl://mail.xxxxxxxxx.com:993" in /www/wwwroot/webmail.xxxxxxxxx.com/rainloop/v/1.14.0/app/libraries/MailSo/Net/NetClient.php:298
Stack trace:...............................

In addition, the following error logs of the mail.xxxxxx.com domain name are generated:

[Sun Jan 10 02:19:25.551306 2021] [ssl:warn] [pid 1756:tid 140405892319104] AH01909: SSL.mail.xxxxxxxxxx.com:443:0 server certificate does NOT include an ID which matches the server name

I had previously installed aapanel on centos 7 again. So I know a little about how to set it up correctly on the mail server. But in the previous installation I was using nginx. Now I installed apache to use apache. I am not familiar with server configuration. Thank you very much for any help.

Note: I installed the server by choosing compiled instead of the fast option. Likewise other necessary setups. Maybe it might be related?