Email fetching constantly stopping

Email fetching constantly stopping

Hello,
 
Just recently, I have run into the problem where email fetching just comes to a stop. We've been testing the environment out for close to a month without any issues, and now all of the sudden, right before going LIVE, this happens.
 
I need assistance ASAP!!!!!
 
Things already done:
  • Rebooted system
  • Cleared the mailbox - This works afterwards, but then stops again.
  • Disabled the Mail loop and mail storm prevention settings.

Is there anything that I am missing here?

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