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It is supported by most mail servers, I guess, and at some time nerds all over the world were heavily promoting this scheme.

I know someone who constantly complained that web site X or company Y are stupid, because they don't follow the RFCs, don't know the syntax of mail addresses, because mail validation in web forms often rejected anything with a plus sign.

The correct answer would have been "don't do it then" or maybe "how about configuring your Exim so that instead of '+' you're using '-' as a separator, but I suppose the complaining was a big part of the fun.






Companies don't follow RFCs, as a rule, bc the only mechanism or means of doing so is if the engineering team implementing the product is aware of the relevant RFCs, and can make a case for following them to the product team. (I.M.Exp.)

There's also a generational memory issue here, and I'm not aware of any C.S./C.E. programs that cover RFCs as part of the core curriculum.




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