[NTLUG:Discuss] How does MAPS RBL work?
Neil Aggarwal
neil at JAMMConsulting.com
Tue Jul 29 19:29:51 CDT 2003
Joseph:
When I changed my sendmail.mc to have the empty third argument string:
FEATURE(`dnsbl',`dnsbl.JAMMConsulting.com',`',`"Your IP address "
$&{client_addr} " was found in our blocking list. Please see
http://www.jammconsulting.com/dnsbl for more information."')dnl
The rejection messages are this:
5.7.1 Rejected: 218.188.36.168 listed at dnsbl.JAMMConsulting.com
Instead of the message that I wanted to tell people.
Any ideas why this is occurring?
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: Monday, July 14, 2003 6:09 PM
> To: NTLUG Discussion List
> Subject: RE: [NTLUG:Discuss] How does MAPS RBL work?
>
>
> 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
> > CNE, CCNP, MCSE, CCNA, AEIOU....
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> >
> >
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>
> =====
> Joe Beasley
> CNE, CCNP, MCSE, CCNA, AEIOU....
> PGP/GPG key -- http://home.attbi.com/~joe.beasley/joebeasley.txt
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> MSN Messenger joebeasley3rd
> ICQ 13164242
>
>
> __________________________________
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> SBC Yahoo! DSL - Now only $29.95 per month!
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>
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