I had accidentally hit the delete button in the mail window, and without any prompt or “are you sure” it just deleted the mail along with 400g in materials. can i please get this restored in some way?? Naxxramas is expensive 
there is a mail restore system.
https://us.battle.net/support/en/help/product/wow/197/1674/solution
This is not for Classic wow, and does not recognize my classic characters.
I know you can get to it through the help menu, did it myself the other day. Search for mail restoration
It does not give me an option to access Deleted mails, only sent and expired, the latest dated from 12/10/2020
hmm… it did like 2 weeks ago… I guess open a ticket?
Are you sure you didn’t hit return?
I wish I had hit return… I hope someone can help me. I sent a ticket through the in game system but it wasnt truly a ticket, it just matched my message with similar types of problems but not exactly.