What is wrong with hmailserver?

Question

hMailServer

Faced with a strange oddity, when trying to send messages to an external mail server, I receive such a letter

Your message did not reach some or all of the intended recipients.

Sent: Sun, 4 Apr 2021 16:04:00 +0300
Subject: ping

The following recipient(s) could not be reached:

[email protected]
Error Type: SMTP
Connection to recipients server failed.
Error: Could not connect to xxx.xxx.xxx.xxx on port 25 since this would mean connecting to myself.

Tried 5 time(s)

hMailServer

I run the diagnostics and it says that everything is OK, except that the folder for the backup is not specified.
I checked the host file - there is nothing suspicious there, tell me where to pick further, I can’t even find anything in Google.