[CentOS] spam control

>>>> 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 currently use:

sbl-xbl.spamhaus.org
dnsbl.ahbl.org
list.dsbl.org
dnsbl.sorbs.net
bl.spamcop.net
dnsbl.njabl.org
spews.dnsbl.sorbs.net
cbl.abuseat.org
relays.ordb.org

Barry