This is a wierd one, I have set all my external pop3/smtp/imap connectivity through the Exchange 2016 server quite some time ago, everyone can login to their mailboxes via pop3 no problem. I’m looking to decom my 2013 DAG and servers now that I’ve got 2016 going well, but for my pop3 users they are unable to connect via pop3 once their mailboxes are moved to the 2016 DAG.
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