Re: [exim] Blocking From: <>

On 2 Dec 2005, at 18:26, Matt wrote:

> I have a few users that have a certain anti-junkmail software. It
> supposeably bounces junkmail. The theory is that the spammer will
> get the bounce and think the email address is no longer valid and
> remove it from there list. I am so sure that happens. In reality
> most times the return address is forged and goes to the wrong place.
>

That's right. It will almost always go to the wrong place. That's
what we call collateral spam. Often, I have more collateral spam in
my mailbox than genuine spam. You should stamp out this behaviour.

> Is there anyway to setup Exim so when it sees a return address of
> "<>" and its not addressed to a local user or from exim itself
> refuse it?
>

Yes. in the RCPT ACL - check SENDER and DOMAIN conditions.
Unfortunately, you'll also be killing things like vacation messages
and other auto-responders. If you don't provide those services on
your server, you could be in trouble here.

--
Ian Eiloart
Postmaster,
IT Services
University of Sussex