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Re:I couldn't buy a car because my email address was 'invalid' by sohex on Monday July 27, 2020 @05:42PM (#23969737)
Well, maybe not a single @. At least one @ maybe. There's a set of special characters that aren't permitted in the local part of an email address including @... unless they're quoted. So "@"@example.com is a valid address.
Re:I couldn't buy a car because my email address was 'invalid' by geoelectric on Monday July 27, 2020 @06:04PM (#23969950)
Oof, thanks. I forgot you could quote the @ and thought it was the one universally illegal character. Also forgot there were others, oops.

I usually just recommend people don't validate email addys and let the email verification message do the job for you. This is pretty much why.