SDP Notification: ERROR : Mail fetching process stopped

Product Name : ManageEngine ServiceDesk Plus - MSP
Build No. : 7513

System Error Notification

An error occured while processing email with
subjectOfMail : Test
messageid : <5D6B2FE8F9B0C1498B023B3454990AC496FA7D1F@arg-xchmb2-vm>.
Mail Fetching process of ServiceDesk Plus was stopped.
Please delete the mail from mail server and restart mail fetching process.

Any idea why this occurs.... the moment we restart the Fetching option in Mail Server settings it works for few minutes and then stops abruptly.... following which we would have to again manually restart the fetching process...

Any particular solution for this case..

Thanks
Mobin