The number of sites that send mail to "foo@bar.com" when you give them "foo@sub....

0xFluegel · on Sept 3, 2020

I can see how that happens immediatly...

    var domain = addr.split(['@','.']).take_last(2)
    var tld = domain[1]
    // check TLD against wacky rules...

See, boss, it's easy. What's next?

snet0 · on Sept 3, 2020

It's also possibly just some arcane regex incantation that someone implemented 12 years ago and nobody has been able to decipher it since.