From: Craig Sanders (no email)
Date: Sat Jun 01 2002 - 20:52:32 EDT
On Fri, May 31, 2002 at 02:53:22PM -0400, Wietse Venema wrote:
> It's an idea. I haven't finished the design. All (client+sender)
> tuples would be 4xx blacklisted by default, without using up any
> storage. New verification requests would be queued, sorted and uniqed
> so that the mechanism can't be DOSed too easily.
this sounds like a really useful anti-spam feature, and i'd like to see
the idea implemented in postfix one day.
one thing occurs to me immediately, though - it would cause long delays
on the receipt of messages from all VERP-enabled mailing lists, because
every VERPed message has a unique sender address.
perhaps there would need to be some programmable or configurable way of
defining VERP patterns...so that we could tell postfix e.g. that yahoo
groups VERPed addresses look like X and some other list looks like Y and
so on. i.e. enable us to teach postfix to interpret VERP addresses so
it knows that
sentto-7654321-12345-1022576631-user=
is really the same sender address as:
sentto-7654321-12345-1022576631-user2=
sentto-7654321-12345-1022576631-user3=
sentto-7654321-12345-1022576631-user4=
...
in fact, it would possibly be simpler to just interpret all addresses
that matched the following pattern as being one sender:
/sentto-.*@returns.groups.yahoo.com/
that would leave a loophole open for spammers to exploit, though.
craig
-- craig sanders <> Fabricati Diem, PVNC. -- motto of the Ankh-Morpork City Watch - To unsubscribe, send mail to with content (not subject): unsubscribe postfix-users
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