DNS issues, reverse lookup, MX records

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

.

Relevant Pages

  • Re: Tracing emails from outside clients
    ... Wherever you wish to host the DNS just make sure you create the identical ... The secondary server arrangement is just a legacy thing. ...
    (microsoft.public.exchange.misc)
  • Re: Web Site Mystery
    ... host our own web site at this location. ... So in our DNS setup, there is a pointer to the ip address of the ... Run an ipconfig /all on your server and you'll see the ... www.europacrown.com don't work from our corporate network. ...
    (microsoft.public.windows.server.general)
  • Re: Web Site Mystery
    ... host our own web site at this location. ... So in our DNS setup, there is a pointer to the ip address of the ... Run an ipconfig /all on your server and you'll see ... www.europacrown.com don't work from our corporate network. ...
    (microsoft.public.windows.server.general)
  • Re: How to disable the "implicit mx record" in Exchange
    ... the host with the A record for the actual domain. ... So when Exchange gets a DNS timeout looking up an MX record, ... their own Exchange or other type of mail server under their own domain name, ... DNS UDP traffic max packet size is ...
    (microsoft.public.exchange.admin)
  • Re: How to disable the "implicit mx record" in Exchange
    ... the host with the A record for the actual domain. ... So when Exchange gets a DNS timeout looking up an MX record, ... our ISP's DNS and perhaps slow response from the recipient domain's ... their own Exchange or other type of mail server under their own domain name, ...
    (microsoft.public.exchange.admin)
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