• The BIND DNS server has already been deprecated and removed from Plesk for Windows.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS. We strongly recommend transitioning to Microsoft DNS within the next 6 weeks, before the Plesk 18.0.70 release.
  • The Horde component is removed from Plesk Installer. We recommend switching to another webmail software supported in Plesk.

Plesk Panel - Mailbox Configuration

This could be related to setting for SMTP Authentication?

An MXtoolbox smtp check for your domain seems to be working ok.

This error should place some lines in the error log.

I see you have a webmail DNS entry - can you send through the webmail interface?
 
Do you get any error messages from webmail?

Also, do you have any entries in /var/log/mail.log
 
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Don't worry about the reverse dns for the moment. This entry is connected to a PTR record and is usually handled by the owner of the IP Address. It's usually the hostname of the server. This shouldn't effect the sending of mail from the server, just the likely hood that messages are filtered as spam.

Any entries in /var/log/mail.log?
 
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