[NTLUG:Discuss] How does MAPS RBL work?

[joseph beasley]

I don't know how they do it without an A record, but it can be looked
up using 'dig -t any bl.spamcop.net'.

--- Carl Haddick <sysmail at glade.net> wrote:
> I have a question about DNS mechanisms.
> 
> On Wed, Jul 02, 2003 at 04:33:18PM -0700, joseph beasley wrote:
> > The queries are direct to their dns server.  If you are using
> sendmail,
> > there are options for RBL servers.  When sendmail receives a
> messages
> > it does a lookup for the ip address of the sending mail server on
> the
> > MAPS dns server.  
> 
> I notice that a number of the popular dns blacklists don't themselves
> resolve.  At this point I don't really need to know why, but I'm
> curious.
> 
> bl.spamcop.net doesn't have an A record, for exmaple, nor does
> sbl.spamhaus.org or spamhaus.relays.osirusoft.com. Interesting - how
> does my machine find the IP address for those name servers without A
> records?
> 
> Sorry if the question is something obvious!
> 
> Regards,
> 
> Carl
> 
> _______________________________________________
> https://ntlug.org/mailman/listinfo/discuss


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Joe Beasley
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