Hello Dave
"sender_verify" will block mail from senders with bad domains, but
it does not catch "spamer123@???" as hotmail.com is a
valid domain.
"sender_verify_hosts_callback" will block that mail, but it is
"expensive" in terms of bandwidth and server load and is subject to
temporary failures due to DNS availability. Using it may well slow
down all incomming mail.
The list of frozen messages provides a verified list of "bad" sender
addresses, at no additional cost. Using them in a block list will not
effect any valid incomming mail.
I was just wondering whether anybody has done it before, and if not,
am I missing something obvious?
Thanks
Ian
On 20 Nov 2001, at 11:56, Dave C. wrote:
>
> You'll want to look into the receiver_verify and sender_verify options,
> which should help prevent such mail from entering your system to begin
> with
>
> On Tue, 20 Nov 2001, I. Forbes wrote:
>
> > Hello All
> >
> > We always seem to have a collection of frozen messages sitting on
> > our mail queue with return addresses like
> > "spammer123@???" (or others that would not get through
> > a decency filter ...). Our setup keeps these on the queue for a few
> > days and then deletes them. Often there are multiple messages
> > from the same address. Obviously for every message that gets
> > stuck, there are many more that get through to clog up our users
> > mailboxes.
> >
> > I was wondering is it possible to setup something that scans the
> > mail queue periodically and adds the return addresses of any
> > frozen messages to a "sender_reject" list. Obviously this could be
> > done independently of exim, with the aid of a python or perl script.
> >
> > - Has anybody tried anything like this?
> >
> > - Is this a function which could/should be incorporated into exim
> > itself?
> >
> > If a sender is trying to send e-mail and his return address is invalid,
> > as demonstrated by frozen bounce messages addressed to that
> > address, surely it is a valid response to deny further mail from that
> > sender.
> >
> > Any comments?
> >
> >
> > Ian
> >
> > ---------------------------------------------------------------------
> > Ian Forbes ZSD
> > http://www.zsd.co.za
> > Office: +27 21 683-1388 Fax: +27 21 674-1106
> > Snail Mail: P.O. Box 46827, Glosderry, 7702, South Africa
> > ---------------------------------------------------------------------
> >
> > --
> >
> > ## List details at http://www.exim.org/mailman/listinfo/exim-users Exim details at http://www.e
xim.org/ ##
> >
> >
>
> --
>
>
>
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Ian Forbes ZSD
http://www.zsd.co.za
Office: +27 21 683-1388 Fax: +27 21 674-1106
Snail Mail: P.O. Box 46827, Glosderry, 7702, South Africa
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