Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Have you ever accessed your email using an email program such as Outlook 2010, Windows mail desktop, thunderbird, etc?
Also, does your email end with @att.net ? ( the one you are trying to recover the missing email from?)
I didnt ask for more money, thats an automated system popup.
if Im going to be able to help you at cost, via written support. Then I need you to read and respond to what I ask you!
Lets try to use the automated feature to restore your deleted mail..
To do so, log into your att / yahoo account first on a web browser. once logged in, then click this link
It should attempt to restore any deleted mail.. Hopefully, it finds what you are missing.
Once complete, do a mailbox search of all your folders including the trash, for the message in question.
If you get stuck or run into any issues, let me know! And best of luck.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.