[OT] username+whatever@isp.org

[rex]

It's fairly common for ISPs to put mail addressed to
[EMAIL PROTECTED] into username's mailbox with the "+whatever"
intact. This is a handy feature for filtering, seeing who's selling
your email addy, etc. In effect, you've got as many mailboxes as you
want with one account.

I'm trying to get my ISP to support this, and need the (sort of) FAQ
on it as a selling point. Anyone got a pointer to it?  AFAIK, it's
not made it into any RFCs.

TIA,

-rex
-- 
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