Hello Peter,
Indeed, the problem is at the DNS configuration level, the problem has just been resolved almost 30 minutes after opening a ticket with Plesk technical support.
Thank you very much for your response.
and I am currently experiencing an issue during the installation of Plesk Email Security Pro on our server running Plesk Obsidian Version 18.0.57 Update #4, with the operating system being Ubuntu 20.04.6 LTS.
The specific problem we are facing is that all sent and received emails are getting...