On Mon, Apr 28, 2008 at 11:44:43PM -0700, Venks Izod wrote:
> I think this question is about outgoing backscatter. Is there a way
> to deny/drop all incoming backscatter?
Not really, if you want to stay RFC compliant.
> 1. Do MTAs consistently indicate in the headers that this is a bounce
They should all use MAIL FROM:<>. I'm not sure they all do.
> 2. does spamdyke have a rule to decide based on this?
I don't think you should unconditionally drop all incoming bounces. It
violates the RFCs IIRC, and is also harmful to your own users, because they
may never realize some of their mail wasn't delivered.
Also, you'll be causing double bounces for everyone who tries to deliver
bounces to you, whether backscatter or not.
> Often a random user in my company will get upwards of 2000 mailer
> daemon messages in one day.
Maybe some MUA-level filtering would help, based on message content...?
What you could and should additionally do, imo, is to complain to the
operator of the server sending the backscatter, and to their provider. If
enough people bug them about it, they may eventually do something.
Andras
--
Andras Korn <korn at chardonnay.math.bme.hu>
<http://chardonnay.math.bme.hu/~korn/> QOTD:
Don't go to work - there's a lot to do.
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