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Restrictive Email Validation

My email is [email protected]. Often it isn't permitted when signing up to services. So I use a+[servicename]@ instead.

Why is this so? I've never seen/written validation rules before so I don't know why this happens.

Any other examples of regularly rejected email addresses?

( 1 comment | 2 points | on HN )
Re:Restrictive Email Validation by mytailorisrich on Saturday September 07, 2019 @03:35AM (#20902376)
It seems highly likely that someone took upon themselves to decide that a single letter before the @ was not a valid email address (it is).

Many email validation functions/regex are also often simply copy-pasted from a google search and poor validation spreads that way...