Email boxes of the domain example.com do not receive incoming mail;
Sending mail is possible;
Issue takes place with both QMail and Postfix;
When a message is sent to the server, no entries in
Mail sent to mailboxes of example.com gets bounced with the following:
CONFIG_TEXT: <email@example.com>: Host or domain name not found. Name service
error for name=mail.example.example.com type=AAAA: Host not
Incorrect MX record specified in DNS settings.
Correct MX record for the domain in Subscription > example.com > DNS Settings.
Note: If DNS settings are not managed by Plesk, change it on the side of DNS hosting provider or contact their support.