Bounce back email error: A database row was deleted while processing the email.

You're a user of Email to Case Premium and File Slayer and are seeing emails bounce back with the following error: An error occurred while trying to deliver the attached email. You may wish to report the following information to the owner of e2cpremium@x-152ckh2z6zrqu9a8guixvh6jk45jsrl9m8bo9lbi1dy1r9646u.u-y3ujmac.na137.apex.salesforce.com.  A database row was deleted while processing the email.  

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Bounce back email error: A database row was deleted while processing the email.
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Bounce-back-email-error-A-database-row-was-deleted-while-processing-the-email