Symptoms
If you enter the QUIT command in a POP3 or IMAP session in Microsoft Exchange Server 2019, the server displays a wrong Exchange Server version:
+OK Microsoft Exchange Server 2016 POP3 server signing off.
Resolution
To fix this issue, install the following cumulative update:
-
Cumulative Update 15 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019