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With any standards compliant email server you can use "+whatever" in the username and the email should get to you: username+whatever@example.com.



"+" is valid in the left-hand side portion and Postfix uses it (by default) as the separator to provide this feature but other mail systems (Qmail and, IIRC, Courier) use "-".

That functionality is not an RFC requirement, however.


I believe that totally depends on the mail server. If there is an actual standard for that, please do point me to it.




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