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Dear "()<>[]:,;@\"!#$%&'*+-/=?^_`{}| ~ ? ^_`{}|~.a"

As I ranted in a recent tweet, "A plus sign is a perfectly valid character in an e-mail address." Yet about half of all sites I visit tell me my e-mail address is invalid when they encounter +.

The format for e-mail addresses is defined in RFC 5321, RFC 5322, and summarized nicely in RFC 3696. For the record, these are all valid e-mail addresses:

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