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Re:Yahoo Triples Estimate of Breached Accounts to 3B by maw on Tuesday October 03, 2017 @06:21PM (#15396695)
Lots of programmers haven't, though.

I get addresses rejected as invalid when signing up for some service at least once a month.

Re:Yahoo Triples Estimate of Breached Accounts to 3B by baddox on Tuesday October 03, 2017 @11:30PM (#15398093)
My favorite is one site I encountered that let you create and login with such an email address, but the forgot password form couldn’t handle it and would 500.
Re:Yahoo Triples Estimate of Breached Accounts to 3B by deathanatos on Tuesday October 03, 2017 @08:16PM (#15397359)
I've seen programmers get overruled by "product managers" in regards to handling email as it is intended to be handled.