[CentOS] spam control

Wed Oct 25 11:47:58 UTC 2006
James Fidell <james at cloud9.co.uk>

R Lists06 wrote:
>>>> I have added the following to /etc/mail/sendmail.mc and rebuilt it
>>>> trying to control spam. I still get about 25 spam messages a day.
>>>> Is there something else that can help control spam?
>> I recommend greylisting.  Check out <http://www.greylisting.org>.  I run
>> gld with a postfix MTA.
>> Barry
> What RBL's, if any, do you use if we may ask?

I have found that greylisting based on the Spamhaus sbl-xbl list
massively reduces spam.  Setting that up on my backup MX
resulted in all traffic through it stopping when my primary MX is

It's sorely tempting to set up a lowest-priority MX that either
points to, or to a machine that has a daemon on port 25
just returning 4xx SMTP errors in response to every connection.