[CentOS] offtopic question .. apprecyice ur help

Ned Slider ned at unixmail.co.uk
Fri Oct 31 14:09:59 UTC 2008


Ralph Angenendt wrote:
> fabian dacunha wrote:
>> its a offtopic question but really apprecite if someone would advise n help
>> i have been running a mil server with sendmail
>>
>> and have sbl-xbl.spamhaus.org as my dnsbl.
>>
>> i had  other servers which are alredy out now
>> that is relays.ordb.org and dsbl.org have already been out of my sendmail
>> config.
>>
>> any one knows of ny other servers i could add in my sendmail config
> 
> Any list which you trust enough to make the decision *which* mails you
> accept for you. 
> 
> Which would leave "none" for me.
> 
> Even sbl.spamhaus.org contains a blacklist, which sometimes lists
> because of the name the machine has (CBL that is).
> 
> Ralph
> 

DNSBL has information on many RBLs together with statistics on their 
effectiveness:

http://stats.dnsbl.com/

Other popular RBLs besides Spamhaus include Spamcop, PSBL and uceprotect.

As Ralph says, any RBL should be used with a certain amount of caution 
as it has the potential to cause FPs (some more so than others). An 
alternative approach is to use such RBLs as part of a scoring system 
such as SpamAssassin. This is particularly useful for RBLs that you 
don't trust to outright reject mail at the smtp level.

If you want to improve on the performance of sbl-xbl.spamhaus.org, I 
would first look at switching to the combined zen.spamhaus.org zone 
which also contains the pbl.spamhaus.org zone. My own data shows 
sbl-xbl.spamhaus.org to block around 50% of spam whereas 
zen.spamhaus.org hits on around 90% of spam with very few FPs for me - 
YMMV. You should monitor performance closely.







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