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christophilus • today at 4:19 AM • 1 reply • view on HN

Honestly, I just validate that it has an @ and then let it through. The actual sender (mailgun, or whatever) can do the dirty work for me.

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Joker_vD • today at 5:59 AM

    \.{1,100}@\.{1,100}
I'd probably also have a red warning line under the input field for something really fishy and also most common typos (like "gmail.con") but other than that, I'd let it through.
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