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Regrettably a significant number of back ends (principally Microsoft ones in my experience) regard the +bit as malformed and reject the email address.

• cpach 12y ago
  Yep. But it can be circumvented if one’s mail server use another delimiter. E.g. ”.” will hardly be filtered.
• SixSigma 12y ago
  Actually yes, I remember now that's why I use - in my Postfix instead. Postfix allows you to choose any character as a separator.