Hi,

think this is going to be a long shot but here goes. 

Version: 10.0 Build 10019, just upgraded to see if it would solve the issue.

Inbound emails, fetching from a mailbox has been working fine, the smtp version to send is still working.

If I double check the details and click save, it reports all saved but could not connect to the mailbox.

I've tried to connect from another service using POP and IMAP and all have been successful. 

Also I am unable to find any logs reporting failure on fetching.

Hope someone can point me in the right directions.

Regards

Paul