[Greylist-users] Re: A Greylisting idea.
David F. Skoll
dfs at roaringpenguin.com
Sun Jun 22 22:00:29 PDT 2003
On Sun, 22 Jun 2003, Eric S wrote:
> to have passed the greylist test), then it could update the existing
> database entry to use a wildcard match for the LHS of the envelope-from,
> to get around the issue with lists that send messages from a different
> address every time for bounce tracking.
Our commercial product (CanIt) works like this:
- We chop off everything after a "+" in the sender address. This takes
care of the Sendmail "plus" hack.
- We chop off everything matching /-\d[^@]*\@/ in the sender address.
foo+bar at domain.net --> foo at domain.net
psql-bounce-12937 at bar.com --> psql-bounce at bar.com
This takes care of all of the address-tracking cases I've seen so far.
We tell our customers to explicitly whitelist any others, though, in case
someone comes up with a different format for address tracking.
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