Issue POP3S SSL not available ?

[Kniar]

Hello,

Since few days our customers using old windows mails clients (like Windows Mail on Windows 7) can't use pop3s (port 995) any more. As they can only choose SSL and not StartTLS in their mail client the connection fails.

It was working few days ago and keep working if they turn to pop3 (port 110).

Recent mail clients have no problem with pop3s.

Plesk version : Obsidian 18.0.34

Is it due to a recent Plesk upgrade ?
Does it exist a solution for these customers to continue using their old mail clients ?

Thanks for your answers,
Kniar