CentOS Linux 7.9.2009
Courier
Plesk Obsidian
Version 18.0.31 Update 2, installed: 1.12.2020
Everything was normal at first, but yesterday the server was restarted and since then the customers have received all emails "twice"
I found this created just yesterday:
support.plesk.com
this is very annoying when an update causes such problems. Customer support is literally flooded with complaints.
Does a plesk sbin mchk --with-spam now have to be carried out on all servers or is the patch expected soon?
Courier
Plesk Obsidian
Version 18.0.31 Update 2, installed: 1.12.2020
Everything was normal at first, but yesterday the server was restarted and since then the customers have received all emails "twice"
I found this created just yesterday:

[BUG] Incoming messages are duplicated on a few or all mailboxes on a Plesk server with Courier
Applicable to: Plesk for Linux Symptoms New incoming messages are duplicated on a few or all mailboxes on the server, regardless of the mail client used. Courier is selected as the IMAP server ...
this is very annoying when an update causes such problems. Customer support is literally flooded with complaints.
Does a plesk sbin mchk --with-spam now have to be carried out on all servers or is the patch expected soon?