”...If you can't find the email in the Trash folder, this may be because you have either accidentally emptied the Trash folder or hit the “Delete Forever” button on a message that was already in the Trash folder.
If this has happened, you can send a request to the Gmail Support Team to ask it to recover these deleted messages and emails in your Gmail account. However, you should not get your hopes up as there is a very good chance that the messages have well and truly disappeared into the ether. This service is geared more towards messages that have gone missing as the result of a Gmail account being compromised.
To submit an enquiry, however, you need to go to Gmail’s missing email web page, and then fill out the form with the necessary details, such as the email address from which the emails have been deleted, whether you are currently logged in, and a short description of the problem.”
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My messages have gone missing - Gmail Help
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How to recover deleted emails in Gmail | IT PRO
