Many systems allow "extensions" such as john-ext or mary+ext
The term used in the vernacular is "sub-addressing" (in everything that I
have seen), and the term in [RFC5233] is "subaddressing" (no hyphen) or
"detailed addressing" (with space). "Plus addressing" (occasionally
"plus-addressing") and "minus addressing" or "'minus' addressing" has also
been seen in the wild. I would change that sentence to say that:
Depends what mail software you're used to. In qmail land they're
definitely extensions, but I'll note they're also called subaddresses.
"and the DNS design that only does exact matching."
I thought that DNS uses ASCII labels, which are matched case-insensitively,
and that there are no other modern options. [RFC4343] [RFC6891] False? See
also Sections 3 and 4 in the I-D.
Yes, the DNS does case folding when it matches names, but that's it,
nothing like prefix matching or ranges or regular expressions or any of
the other stuff one takes for granted in normal databases.
Take a particular look at section 5, which publishes regular
expressions to match a domain's mail addresses.
So what do you think of the regex hack?
Regards,
John Levine, [email protected], Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail.
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