tpalfy commented on PR #8494:
URL: https://github.com/apache/nifi/pull/8494#issuecomment-2108094848

   Hi @AnTu2702,
   
   Do you happen to try connecting to an Office365 account?
   The issue you mention didn't occur when I was testing but when googled it, 
it gave me several results users complaining about this when using Office365.
   
   According to one search result this can be caused by clients that are trying 
to connect too frequently. Can you try lowering the schedule period and see if 
that helps?
   Others suggest checking the OAuth config of Office365.
   
   Couple of links for reference:
   
https://confluence.atlassian.com/jirakb/imap-fails-with-a3-bad-user-is-authenticated-but-not-connected-error-in-jira-server-integrated-with-office365-665420269.html
   https://github.com/mscdex/node-imap/issues/689


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