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A comment on The Correct Way to Validate Email Addresses. Parent comment

Re:The Correct Way to Validate Email Addresses by ediblenergy on Thursday September 08, 2016 @01:19PM (#12454998)
It actually used to (maybe still does) signal routing information[1]. An example from the RFC is "@ONE,@TWO:JOE@THREE" [1]: https://tools.ietf.org/html/rfc821
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