[NTLUG:Discuss] How does MAPS RBL work?

[joseph beasley]

Check http://www.sendmail.org/m4/anti_spam.html for the format of the
line in the sendmail.mc.  The backticks are important.  The link lists
the format as "   FEATURE(`dnsbl', `dnsbl.example.com', `', `"451
Temporary lookup failure for " $&{client_addr} " in
dnsbl.example.com"')
 " 

You don't have the `', before the error message starts. 


--- Neil Aggarwal <neil at JAMMConsulting.com> wrote:
> Joseph:
> 
> I tried a test.  I set up a mail server on a DSL connection.  The
> server is configured to use DNS servers provided by Verizon.
> 
> On that server, I added this line to my sendmail.mc file:  
> FEATURE(`dnsbl',`dnsbl.JAMMConsulting.com',`"Your IP address "
> $&{client_addr} " was found in our  blocking list. Cable DSL and
> dialup
> users must use your ISPs mail server."')dnl
> 
> When I send an email to that server, it performs a query on the 
> dnsbl.JAMMConsulting.com by sending a query to Verizon's
> DNS server which in turn sends the query to our DNS server
> that hosts our dnsbl.   The queries are not sent directly
> to our dnsbl server.
> 
> What directives do you use to make sendmail query the
> dnsbl server directly?
> 
> Thanks,
> 	Neil
> 
> 
> --
> Neil Aggarwal, JAMM Consulting, (972)612-6056, www.JAMMConsulting.com
> FREE! Valuable info on how your business can reduce operating costs
> by 
> 17% or more in 6 months or less! =>
> http://newsletter.JAMMConsulting.com
> 
> > -----Original Message-----
> > From: discuss-bounces at ntlug.org 
> > [mailto:discuss-bounces at ntlug.org] On Behalf Of joseph beasley
> > Sent: Wednesday, July 02, 2003 6:33 PM
> > To: NTLUG Discussion List
> > Subject: RE: [NTLUG:Discuss] How does MAPS RBL work?
> > 
> > 
> > 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.  
> > 
> > You do not have to change the dns server on your mail server.  You
> do
> > have to change your sendmail.cf so that it knows what RBL to use.
> > 
> > --- Neil Aggarwal <neil at JAMMConsulting.com> wrote:
> > > Chris:
> > > 
> > > > I did some digging.
> > > > First, they offer two types of server, as I kinda said in my 
> > > > original reply. one
> > > > is query, the other is zone transfer.
> > > 
> > > I am more interested in offering the direct query approach.
> > > 
> > > > Their query option is just that, a direct query.
> > > > You make a good point about your primary DNS server doing the 
> > > > query of the
> > > > authoritative DNS server on behalf of the client and 
> > > > returning the results.
> > > > However, the contract that MAPS has you complete only asks 
> > > > for your mail server
> > > > IP address. This tells me that your IP address must ride 
> > on the UDP
> > > > communication for DNS queres.
> > > > That fact of the matter is that the IP address of the mail 
> > > > server must be
> > > > getting to the MAPS dns server so they can verify 
> > > > authenticity. There is no
> > > > documentation that tells you that you must change the primary 
> > > > DNS server of your
> > > > mail server to their server. I can't believe they would have 
> > > > you do this anyway,
> > > > because they have 5+ DNS servers running across the world for 
> > > > disaster recovery.
> > > > This would make a painful maintenance effort.
> > > 
> > > This is exactly the question:  How do they force the mailserver
> > > to make a direct query to their DNS servers?
> > > 
> > > > Here are some links for ya.
> > > > http://mail-abuse.org/feestructure.html
> > > > http://mail-abuse.org/rbl/usage.html
> > > 
> > > I appreciate your efforts, but I read thru those before
> > > posting this thread.  They don't answer the question at hand.
> > > 
> > > Thanks,
> > > 	Neil.
> > > 
> > > 
> > > --
> > > Neil Aggarwal, JAMM Consulting, (972)612-6056, 
> www.JAMMConsulting.com
> > FREE! Valuable info on how your business can reduce operating costs
> > by 
> > 17% or more in 6 months or less! =>
> > http://newsletter.JAMMConsulting.com
> > 
> > 
> > _______________________________________________
> > https://ntlug.org/mailman/listinfo/discuss
> 
> 
> =====
> Joe Beasley
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> 
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=====
Joe Beasley
CNE, CCNP, MCSE, CCNA, AEIOU....
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