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451.4.4.0 DNS query failed

I am using exchange 07 but we still rout our mail through a 3rd party (network solutions) so we have an SMTP connector and POP3 for incomming. I am also getting this error on some emails. When I do the nslookup comand it times out as well. parrishconstruction.com is our domain. Our mx record was setup as mail.parrishconstruction.com so I have the reverse lookup set as that with our ISP. When the email leaves our office the header most have our exchange server in the ID and then I don't know what happens to it at Network solutions. I would assume the reverse of mail.parrishconstruction.com sould resolve the reverse DNS but we still have problems at times? I am somewhat new to this stuf so I am not sure what else to look at. Thanks! Running exchange 07
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criceparrish
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criceparrish
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MesthaCommented:
If you are routing email through another host, then there is little that you can do. If they are accepting your email then thats it - the email delivery is out of your hands.

If you have a static IP address and were able to get a reverse DNS record set then switch to direct delivery for both inbound and outbound email.

Simon.
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criceparrishAuthor Commented:
I orginaly tried that, but our sender rating dropped very quickly, and it just seems very hard to manage that. I have considered going with a different provider to use a smart host (Go Daddy). Any suggestions on that? Is there anything I can have our current provider do to improve this (NetWork Solutions)? Thanks.
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MesthaCommented:
Your ISP will have a server that you can route email through.
Unless your ISP has given you a set of IP addresses that are on blacklists, sending directly shouldn't make that much difference, as long as everything is setup correctly DNS wise. That means having a valid A record pointing to the server with a matching PTR (Aka reverse DNS) record.

Simon.
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criceparrishAuthor Commented:
What if I create an A record with our host called remote.parrishconstruction.com pointing to our IP address and have our reverse record also resolve to remote.parrishconstruction.com? Would that work?
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MesthaCommented:
You don't create either internally, only on external DNS systems. Your ISP will setup the reverse DNS/PTR record for you. However once both are set and live, that should allow you to deliver email directly.

Simon.
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criceparrishAuthor Commented:
Adjusted forward and reverse DNS and that resolved the issue
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