• 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.

Issue Email System

Its a simple gmail 5.7.1 meaning your Mail-server is not considered reliable/safe.

This is a more complex requirement in configuration, mostly due to Google. Most likely you can mail to some others, but google doesnt accept mailers, which dont comply to their minimum requirements.

Or in other words: gmail considers your email as spam.

Go for a mail checker, eg Domain Health Check - Online Domain Tools - Blacklist, Email, Website, DNS - MxToolBox
 
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