SharePoint incoming email stuck in drop folder

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There will be situation where we have lots on emails in drop folder and SharePoint timer job is not able to process them.

There will be no error message but document libraries and list will not receive any incoming email.
Drop folder will keep on growing until it reaches to quota limit.

In timer job status we will get Windows SharePoint Services Incoming E-Mail server Initialized 0%

RESOLUTION/WORKAROUND:
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  • Move all the emails from drop folder to any other folder.
  • During that move one of the email will not copy.
  • That one is the issue email.
  • Stop timer and try to move that email, but move it in any other folder.
  • Start the timer and then move all emails back to drop folder except the faulty email.
  • Timer will start processing the email.
  • If it stuck again repeat the process again.

You can compare the faulty email with the working email in any comparison tool like beyond compare to find the difference.