Re: PTR Records and hosting our own mail

From: Javier Gomez [SBS MVP] (javier_gomez_at_remove.this.engineer.com)
Date: 07/10/04 

Date: Sat, 10 Jul 2004 16:45:55 -0400

Hi Chester!

Your PTR record should be something like:
12.125.68.69.in-addr.arpa PTR mail.yourdomain.com
where mail.yourdomain.com is the A record of your primary MX. Just for
completeness sake I would create an A record "mail.yourdomain.com" and point
it to 69.68.125.12 and then change the MX10 to point that record instead.

Another thing you might want to try is using the smarthost of one of your
other ISPs. 

-- 
Javier [SBS MVP]
<< SBS ROCKS !!! >>
"Chester" <chester@NOSPAMprosoundusa.com> wrote in message
news:%23xGBSCrZEHA.1656@TK2MSFTNGP09.phx.gbl...
> Hello Javier,
>     I've read the article, and we used some of the links at the end to
test
> our server. Yes, we do have a PTR record, but it points to Company B who
> owns the IP static IP addresses we use. So I gather that we need to
contact
> them like you mentioned. Now, do we ask them to change the PTR record for
> our IP addresses to point to our domain (prosoundusa dot com)?
> Sorry if this is elementary, I'm just trying to get my head wrapped around
> exactly what to ask for.
>
> Thanks!
>
> Chester
> "Javier Gomez [SBS MVP]" <javier_gomez@remove.this.engineer.com> wrote in
> message news:e88ibSqZEHA.1508@TK2MSFTNGP09.phx.gbl...
> > Can you post the NDR that you get when you try to send mail to the
> > problematic domains?
> >
> > The last section of this article deals with determining if you have the
> > proper PTR records (which for prosound dot com they are only "generic").
> Is
> > not just having PTR records, its having them match your domain. Also
> > remember there are other reasons for being blacklisted.
> > http://www.sbslinks.com/DNS_Smarthost.htm
> >
> > From your example you would have to contact Company B for getting the
> proper
> > PTR record (which are the ones that "owns" the IP range).
> >
> > -- 
> > Javier [SBS MVP]
> >
> > << SBS ROCKS !!! >>
> >
> > "Chester" <chester@NOSPAMprosoundusa.com> wrote in message
> > news:O0UDpxpZEHA.3664@TK2MSFTNGP12.phx.gbl...
> > > Hello,
> > > We are hosting our own mail on our SBS2k3, and using DNS to send mail.
> > (Not
> > > through a SmartHost).
> > >
> > > However, there are several domains that have been rejecting our mail,
> > > apparently using ReverseDNS, and finding that our domain (prosoundusa
> dot
> > > com) is not hosted at the mail server's IP address.
> > >
> > > We tried sending mail to those troublesome domains through a
SmartHost,
> > but
> > > still no luck, the messages still got refused!
> > >
> > > To complicate matters,
> > >
> > > Company A hosts our domain/website,
> > > Company B provides our DSL (w/static IP),
> > > Company C contracts with Company B to provide mail services to the DSL
> > > accounts (We don't use their mail, but POP and SMTP accounts are
> > available),
> > > We have a DynDns account to associate a domain name with our static
IP,
> > > and WE host our own mail server! Complicated enough?
> > >
> > > So, the question is, what can we do so that reverse DNS lookups (or
> > whatever
> > > these troublesome domains are using to decide to reject our mail)
> resolve
> > to
> > > our mail server's IP or Domain name?
> > >
> > > Is it the PTR? If so, WHO in the above list is responsible for that
> > record?
> > >
> > >
> > > Thanks!
> > >
> > > Chester
> > >
> > >
> >
> >
>
>

Relevant Pages

  • Re: PTR Records and hosting our own mail
    ... Javier got you on the right track. ... Yes, we do have a PTR record, but it points ... >our IP addresses to point to our domain (prosoundusa dot ... DNS to send mail. ...
    (microsoft.public.windows.server.sbs)
  • Re: Error 7010 in event log / "Unable to Relay"
    ... Can you send mail (to the internet) at all? ... Javier [SBS MVP] ... "Chester" wrote in message ...
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  • Re: Exchange - Undeliverable - Reverse DNS
    ... The remote site is applying some sort of analysis to the PTR record associated with your public IP. ... but will only become more and more commonplace as companies fight to keep spam to a manageable level. ... Best practice (ie complying with the RFCs [internet standards]) is to have that be the same as the name in your MX record, so if your ISP will co-operate, I'd arrange to change it. ... Steve Foster [SBS MVP] ...
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  • Re: DNS or SMART HOST
    ... > so the PTR record is pointing to the ISP and not the domain ... Javier [SBS MVP] ...
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