Re: PTR Records and hosting our own mail
From: Tony Su (anonymous_at_discussions.microsoft.com)
Date: 07/10/04
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Date: Sat, 10 Jul 2004 13:47:51 -0700
Javier got you on the right track.
You need to ask your the Manager of your DNS records to
add an MX record with your SBServer address, but with a
very low priority so that mail will continue to be routed
through your ISP.
Of course the A record supporting your MX record should
have a PTR to support reverse lookups.
Tony Su
>-----Original Message-----
>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
>> >
>> >
>>
>>
>
>
>.
>
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