It was not possible to set up mail.
My boxing is placed on Hezner.
The mail provider says it doesn't have any blocks on my IP.
In CentOS, I, for example, opened port 465 (see screenshot).
But it still fails to connect to the server. From my laptop without problems. Tried via telnet.
Please advise more experienced, what I am doing wrong? Maybe there are some nuances with this hosting?
Before moving Box to Hezner, there were no problems.