Maybe a solution to this could be the mail client/system sending an automated email to the sender on your return (as a reminder). "Two weeks ago, you sent me a

Maybe a solution to this could be the mail client/system sending an automated email to the sender on your return (as a reminder). "Two weeks ago, you sent me an email, however my mail client automatically deleted it. If it is something I can still help you with, please reply back with the original email. -- this is an automatically generated email --"