> We have a large volume of mail messages and a lot of them are serious ones, having legal consequences.
In the context of this, and GDPR, and security, and backups, and loads of cheap storage, I really don't understand why you use POP3.
You're correct in that it does not make sense, but I have had no time to deal with it as well. There's a backlog of a zillion things to do, this would be another bullet in it.
Unfortunately, it has been announced that we'll be moving to M365 by the end of the year, hence no point in spending non-existent available time to something that will go to the wastebasket. I was against this decision, since it implicated moving mails and documents to Azure. Seems I'm the only one shouting.
@Stefano: that's a great success story there, glad it all worked out.
But not all stories get a happy ending, sometimes resources (personnel time+money) are simply not there for things to happen.
Wrote this while having a small break eating something. Don't know if I'll have the time to philosophize soon again.