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[–] 4 points 1 month ago

It's even worse when some idiot dev decides what an email should look like and doesn't properly implement RFC822 (or whichever one specifies all the random bits of a valid email address).

The current recommendation is to check for an @ symbol. It's pretty much the only concrete rule.
If an email address has to exist, the only way is to send it an email and have the user click a link.

https://beesbuzz.biz/code/439-Falsehoods-programmers-believe-about-email

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