Re: [cobalt-users] dnsbl advise...

[John D Gorena <Support@xxxxxxxxxxxxxxxxxxx>]

Larry,
> 
> Hmmm,  agree that mailscanner is "good" both from the perspective of cutting
> unwanted attachments and spam, but not sure how using DNSBL's could/would
> give errors or imcomplete message handling. (In fact mailscanner includes the
> capability of using dnsbl's in its scan).   I would be very interested in any
> particulars about this since DNSBL works via "DNS" - meaning that one asks if
> a reverse quad (IP in reverse) is listed with "that" dnsbl the same as asking
> if a host has an IP - and gets either a response or none.  No response is the
> same as not listed.  Worst case (other than the one dnsbl that chaged its
> record to report _all_ ip) is the short timeout for the dns query -
> generally....
> 
> EG:
> # host 211.206.106.131
> Host not found.
> # host 131.106.206.211.korea.services.net
> 131.106.206.211.korea.services.net has address 127.0.0.2
> #  host 131.106.206.211.dnsbl.njabl.org
> Host not found.
> 
> --
> Larry Smith
> SysAd ECSIS.NET
> sysad@xxxxxxxxx


Larry,

Is there a setting to set MailScanner to check for Reverse DNS as you
described.  It does not seem to be working that way for me.  Any suggestions or
a setting that I need to recheck?

John