Problem with Mail and impact on Mail Fetching...

Recieved the below errro over the weekend for Service Desk Plus and the Mail Fetching service stopped and wouldnt restart...Have searched the forums but can find nothing specific

anyone have any ideas?

Its all working again now, however would like to understand what exactly the issue was, as these emails are submitted several times a day normally with no problem, so for this one to cause an error seems strange.

Product Name : AdventNet ManageEngine ServiceDesk Plus
Build No. : 6013

System Error Notification

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An error occured while processing email with
subjectOfMail : OFS Monitoring
messageid : <000001c84346$67facac0$372d0a0a@domain.COM>.
Mail Fetching process of ServiceDesk Plus was stopped.
Please delete the mail from mail server and restart mail fetching process.