Hello,

I've done some searching in the groups, but I'd like to pose a specific
scenario. We are getting these errors:

#4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your reverse
hostname,


This is the situation. Our domain name is registered with network
solutions. Our website is hosted with Yahoo on a business account.
Yahoo used to host our email as well. Recently we put in a local SBS
2003 server to host our Exchange locally. Originally our Network
solutions account had all DNS pointing to Yahoo's name servers, as it
should have. We wanted to switch the MX record to point to our static
IP on our T-1 for our new server. However, we can't have the www
address point to a single IP with Yahoo. Yahoo requires that we just
redirect Network Solutions DNS to them. So we reverted all DNS back to
Yahoo.

Now Yahoo has static entries for www and mail .domain.com pointing to
internal yahoo server, which we can't change. We added a record for
our mail server: server.domain.com and pointed it to our static
external IP address. We also created an MX record for
server.domain.com. Email started flowing in as expected.

However now some email systems, most notably AOL and Comcast, are
resolving our name it seems. We are getting the message I posted
above. Many of the postings I've read say that we need to add a PTR
record for our mail server. Is that on our local internal DNS or on an
external? If it is external DNS, then whos? Our ISP (AT&T) or on
Yahoo?

Thank you,
Brandon Riffel

Speak to your leased line provider as they will probably have a reverse
lookup zone for your subnet. You will need to get them to add a ptr record
that resolves a fqdn to your mailservers public ip address. For example if
your mailserver is to be called mail.mydomain.com and your ip address is
1.2.3.4 then the ptr record would be:

4 ptr mail.mydomain.com. (4 being the final octet of your ip address)


Hope this s

Richard Rustean

"bjriffel@hotmail.com" wrote:

> Hello,
>
> I've done some searching in the groups, but I'd like to pose a specific
> scenario. We are getting these errors:
>
> #4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your reverse
> hostname,
>
>
> This is the situation. Our domain name is registered with network
> solutions. Our website is hosted with Yahoo on a business account.
> Yahoo used to host our email as well. Recently we put in a local SBS
> 2003 server to host our Exchange locally. Originally our Network
> solutions account had all DNS pointing to Yahoo's name servers, as it
> should have. We wanted to switch the MX record to point to our static
> IP on our T-1 for our new server. However, we can't have the www
> address point to a single IP with Yahoo. Yahoo requires that we just
> redirect Network Solutions DNS to them. So we reverted all DNS back to
> Yahoo.
>
> Now Yahoo has static entries for www and mail .domain.com pointing to
> internal yahoo server, which we can't change. We added a record for
> our mail server: server.domain.com and pointed it to our static
> external IP address. We also created an MX record for
> server.domain.com. Email started flowing in as expected.
>
> However now some email systems, most notably AOL and Comcast, are
> resolving our name it seems. We are getting the message I posted
> above. Many of the postings I've read say that we need to add a PTR
> record for our mail server. Is that on our local internal DNS or on an
> external? If it is external DNS, then whos? Our ISP (AT&T) or on
> Yahoo?
>
> Thank you,
> Brandon Riffel
>
>

Short answer to your last question... your ISP.

The PTR is done by whomever you obtained the static IP from. They "own" it
and should either configure the reverse lookup for you, or provide you with
an interface so you can do it yourself.

-Frank


<bjriffel@hotmail.com> wrote in message
news:1168010399.652483.221620@s80g2000cwa.googlegr oups.com...
> Hello,
>
> I've done some searching in the groups, but I'd like to pose a specific
> scenario. We are getting these errors:
>
> #4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your reverse
> hostname,
>
>
> This is the situation. Our domain name is registered with network
> solutions. Our website is hosted with Yahoo on a business account.
> Yahoo used to host our email as well. Recently we put in a local SBS
> 2003 server to host our Exchange locally. Originally our Network
> solutions account had all DNS pointing to Yahoo's name servers, as it
> should have. We wanted to switch the MX record to point to our static
> IP on our T-1 for our new server. However, we can't have the www
> address point to a single IP with Yahoo. Yahoo requires that we just
> redirect Network Solutions DNS to them. So we reverted all DNS back to
> Yahoo.
>
> Now Yahoo has static entries for www and mail .domain.com pointing to
> internal yahoo server, which we can't change. We added a record for
> our mail server: server.domain.com and pointed it to our static
> external IP address. We also created an MX record for
> server.domain.com. Email started flowing in as expected.
>
> However now some email systems, most notably AOL and Comcast, are
> resolving our name it seems. We are getting the message I posted
> above. Many of the postings I've read say that we need to add a PTR
> record for our mail server. Is that on our local internal DNS or on an
> external? If it is external DNS, then whos? Our ISP (AT&T) or on
> Yahoo?
>
> Thank you,
> Brandon Riffel
>

Does anybody have any experience getting AT&T to actually do that?


Frankster wrote:
> Short answer to your last question... your ISP.
>
> The PTR is done by whomever you obtained the static IP from. They "own" it
> and should either configure the reverse lookup for you, or provide you with
> an interface so you can do it yourself.
>
> -Frank
>
>
> <bjriffel@hotmail.com> wrote in message
> news:1168010399.652483.221620@s80g2000cwa.googlegr oups.com...
> > Hello,
> >
> > I've done some searching in the groups, but I'd like to pose a specific
> > scenario. We are getting these errors:
> >
> > #4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your reverse
> > hostname,
> >
> >
> > This is the situation. Our domain name is registered with network
> > solutions. Our website is hosted with Yahoo on a business account.
> > Yahoo used to host our email as well. Recently we put in a local SBS
> > 2003 server to host our Exchange locally. Originally our Network
> > solutions account had all DNS pointing to Yahoo's name servers, as it
> > should have. We wanted to switch the MX record to point to our static
> > IP on our T-1 for our new server. However, we can't have the www
> > address point to a single IP with Yahoo. Yahoo requires that we just
> > redirect Network Solutions DNS to them. So we reverted all DNS back to
> > Yahoo.
> >
> > Now Yahoo has static entries for www and mail .domain.com pointing to
> > internal yahoo server, which we can't change. We added a record for
> > our mail server: server.domain.com and pointed it to our static
> > external IP address. We also created an MX record for
> > server.domain.com. Email started flowing in as expected.
> >
> > However now some email systems, most notably AOL and Comcast, are
> > resolving our name it seems. We are getting the message I posted
> > above. Many of the postings I've read say that we need to add a PTR
> > record for our mail server. Is that on our local internal DNS or on an
> > external? If it is external DNS, then whos? Our ISP (AT&T) or on
> > Yahoo?
> >
> > Thank you,
> > Brandon Riffel
> >

Call them? After all, you did buy your static IP from them. How did you
contact them then?

-Frank

<bjriffel@hotmail.com> wrote in message
news:1168227551.513106.58760@v33g2000cwv.googlegro ups.com...
> Does anybody have any experience getting AT&T to actually do that?
>
>
> Frankster wrote:
>> Short answer to your last question... your ISP.
>>
>> The PTR is done by whomever you obtained the static IP from. They "own"
>> it
>> and should either configure the reverse lookup for you, or provide you
>> with
>> an interface so you can do it yourself.
>>
>> -Frank
>>
>>
>> <bjriffel@hotmail.com> wrote in message
>> news:1168010399.652483.221620@s80g2000cwa.googlegr oups.com...
>> > Hello,
>> >
>> > I've done some searching in the groups, but I'd like to pose a specific
>> > scenario. We are getting these errors:
>> >
>> > #4.7.1 smtp;450 4.7.1 Client host rejected: cannot find your reverse
>> > hostname,
>> >
>> >
>> > This is the situation. Our domain name is registered with network
>> > solutions. Our website is hosted with Yahoo on a business account.
>> > Yahoo used to host our email as well. Recently we put in a local SBS
>> > 2003 server to host our Exchange locally. Originally our Network
>> > solutions account had all DNS pointing to Yahoo's name servers, as it
>> > should have. We wanted to switch the MX record to point to our static
>> > IP on our T-1 for our new server. However, we can't have the www
>> > address point to a single IP with Yahoo. Yahoo requires that we just
>> > redirect Network Solutions DNS to them. So we reverted all DNS back to
>> > Yahoo.
>> >
>> > Now Yahoo has static entries for www and mail .domain.com pointing to
>> > internal yahoo server, which we can't change. We added a record for
>> > our mail server: server.domain.com and pointed it to our static
>> > external IP address. We also created an MX record for
>> > server.domain.com. Email started flowing in as expected.
>> >
>> > However now some email systems, most notably AOL and Comcast, are
>> > resolving our name it seems. We are getting the message I posted
>> > above. Many of the postings I've read say that we need to add a PTR
>> > record for our mail server. Is that on our local internal DNS or on an
>> > external? If it is external DNS, then whos? Our ISP (AT&T) or on
>> > Yahoo?
>> >
>> > Thank you,
>> > Brandon Riffel
>> >
>

bjriffel@hotmail.com wrote:
> Does anybody have any experience getting AT&T to actually do that?

AT&T creates default PTR records for all their IP addresses usually in the
form of
ANSWER SECTION:
220.91.65.65.in-addr.arpa. 7199 IN PTR
adsl-65-65-91-220.dsl.wcfltx.swbell.net.
Which satisfies AOL's PTR requirements.

They will not create custom PTRs unless they also host the forward zone for
your domain name and you also have a static IP. $100 setup and $50 for
modifications. http://dialup.swbell.net/customer/dn_worksheet.html


If you have static IPs they will delegate reverse lookups, but you must have
a registered DNS server for them to delegate to, or a DNS server that
supports PTR records in the forward zone. This rules out most DNS hosting
providers because they do not support reverse lookup zones and/or PTR
records in the Forward lookup zone.



--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This s
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