Tech Support > Computers & Technology > Internet & Broadband > How to stop spammers bringing our server down?
How to stop spammers bringing our server down?
Posted by Java Jive on November 3rd, 2007


I hesitate to speak because I'm neither Unix nor mail expert, but
surely it should be possible to set up firewall rules to prevent this?

Particularly, if the attacks are coming from known IPs, then it should
relatively simple to prevent connections of any sort from those IPs?

On Sat, 03 Nov 2007 11:00:39 +0000, Peter
<occassionally-confused@nospam.co.uk> wrote:

Posted by Bob Eager on November 3rd, 2007


On Sat, 3 Nov 2007 15:05:48 UTC, occassionally-confused@nospam.co.uk
wrote:

You have to keep them up to date, but chances are they are already
blacklisted (or on a normal mail PBL).

Can you set up sendmail to reject IPs on blacklists? That might be a lot
more efficient. I know that in Postfix it's effectively just one line in
the config file, but God knows what that is in sendmail...
--
[ 7'ism - a condition by which the sufferer experiences an inability
to give concise answers, express reasoned argument or opinion.
Usually accompanied by silly noises and gestures - incurable, early
euthanasia recommended. ]

Posted by Bob Eager on November 3rd, 2007


On Sat, 3 Nov 2007 17:14:58 UTC, Peter
<occassionally-confused@nospam.co.uk> wrote:

I use spamhaus, which I found a bit more accurate. Might be worth trying
that list instead.

Don't know about overriding the list; it's never come up here, and I use
Postfix anyway.
--
[ 7'ism - a condition by which the sufferer experiences an inability
to give concise answers, express reasoned argument or opinion.
Usually accompanied by silly noises and gestures - incurable, early
euthanasia recommended. ]


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