How to solve “Suspicious process running under user” and “Excessive resource usage”

Sometimes some necessary processes use a lot of resources on the server and the system often starts to notify about it by email.
For example, as in my case, after installing the Zabbix agent, notifications began to come:

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How to solve Cpanel::MailAuth: cphulk blocked login for user to access service ‘mail’

I noticed somehow that mail from Cpanel does not open through the Web Roundcube, SquirrelMail, Horde, and also you can’t connect to mail from PHP scripts.

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The problem with multiple SSL on the same IP

If there are several sites with SSL on the same IP address, then old ancient browsers that do not support SNI will not be able to determine which certificate to download and will most likely download the first one that is registered at the beginning of the web server configuration.

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cPanel. Solution of the error “dovecot: pop3-login: Disconnected (no auth attempts in 0 secs)”

Recently, Dovecot was automatically updated on one of the servers with cPanel, and the PHP self-recording system stopped importing letters, that is, it could not connect to the mail server, in the log file /var/log/maillog I discovered the following:

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