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I think "cheers" would be a variant of "Cheerio", which just means goodbye - nothing to do with booze.

I never had a sig - not for email, not for Usenet. At one time I just signed off with my name; nowadays I make do with a bare carriage-return. I figure people will be able to work out when they've got to the end.

"Cheers" is sometimes used instead of thank you in Great Britain I think.

Can confirm, I’m British and often use “cheers” to mean “thank you”.

Was going to add the same thing but wasn't sure if it was a Scottish specific or generic British thing.

It never occurred to me that "cheers" as a closing has anything to do with alcohol.