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> Anything you can send an email to that is received, as far as I am concerned.

100% this.

The only acceptable hard validation is to check whether there is an @ between some characters. something like `.@.` in regex.

It makes sense to do sanity checking (soft validation) on client side. There is 99.9% chance that `muppet@gmial.com` is wrong, outright rejecting that is wrong, though.




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