• 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.

Resolved Cannot recieve Emails / forward Emails

Do you have any related error messages in Plesk maillog?
 
connect to gmail-smtp-in.l.google.com[2a00:1450:400c:c06::1a]:25: Network is unreachable
This means your server is trying to connect to the Google SMTP via IPv6 protocol. This doesn't work as your network probably doesn't support IPv6.
To get rid of the error message, you can configure Postfix not to use IPv6 by editing your /etc/postfix/main.cf with this directive:

inet_protocols = ipv4

Then restart postfix:

/etc/init.d/postfix restart
 
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