This is not a new term, but a new use for an existing one.

Fail Mail: When a user's email gets stuck in their Outbox and refuses to be sent, for any reason.
John found out why Julia had not received his invitation. There it was, stuck in his Outbox. His beautifully written, sweet, sincere invitation to the girl of his dreams had turned into fail mail.
by Airman Spiff July 13, 2012
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A group email from your lecturer/boss/other alerting you and others on the mailing list of your failure.
"Yo, I saw your name on the Fail Mail dude....see you in summer school"
by Lpaq the don November 18, 2009
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a) When you send an e-mail to the wrong person

b) When you receive someone else's mail.

c) When you receive mail or an e-mail saying you have lost a family member, your house burnt down, you lost your job etc.
a) Oh, crap! I just sent the love letter for the girl I'm cheating with to my wife!

b) Hey, Mr. Nicolas! I got you mail by mistake! I didn't know you were a hooker!

c) I got fail mail from my boss. He fired me for being late yesterday.
by Wolf5297 December 19, 2009
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Imagine doing a countdown and end up with terrible timing
10 9 8 7 6 5 4 3 2 1 0 ........ Nothing happens

That's fail mail
by Mail moment July 20, 2023
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Sending an email that you think drives your point home, but is lost on the recipient. This could be dmail or a CLM depending on the context. Often used by people born before 1999 as a method of communication.
Chad's email said that he liked her better than Troy Aikman. But she didn't understand this mail fail, was he gay, or does he just like football a lot?
by The mad shatter November 15, 2017
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when you call someone and have a conversation with what you think is them, but is actually their voicemail.
"I thought I was talking to Clint, but it was just a voice mail fail."
by skm7227 April 18, 2010
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