Exchange 2003 - email going to junk between servers on same domain

I have 2 exchange servers on my domain (moving to new box). The email had been flowing great for weeks without issues. During the last couple days people on primary exchange - sending to people on the new exchange - email is going to junk. I tried to add domain safe in Outlook to no affect. I need to allow email between these exchange boxes not be spam. I am sure what has changed and why.

Any ideas?
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Thomas WheelerCommented:
Are these both Exchange 2003 servers? Do you have service pack 2 installed and IMF configured? Sounds like it could be an IMF issue.
allenkentAuthor Commented:
They are both 2003 servers. The issues was solved by rebooting our DNS server. Not sure why this would fix the issue but the moment the DNS was rebooted all mail started flowing correctly.
Thomas WheelerCommented:
that is strange. Well great glad you got it fixed.
10 Tips to Protect Your Business from Ransomware

Did you know that ransomware is the most widespread, destructive malware in the world today? It accounts for 39% of all security breaches, with ransomware gangsters projected to make $11.5B in profits from online extortion by 2019.

allenkentAuthor Commented:
Ok - the issue is back again. I have not rebooted DNS yet.

2 Exchange 2003 servers. I have disabled IMF (did not fix issue). I do have SP2 installed. I have rebooted both Exchange servers. I will reboot DNS in a moment and see if that fixes again.
Thomas WheelerCommented:
on the exchange servers are both systems resolving via nslookup?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
allenkentAuthor Commented:
Odd. Used the following:

NSLOOKUP Server1  (get nice results)

NSLOOKUP Server2 : (get message saying Non-Existent Domain)
allenkentAuthor Commented:
Got It!! The NSLOOKUP help point in the right direction. It looks like my new DNS (secondary) server is not function correctly. The Email Server #2 had the primary DSN as our dns new server address and the secondary dns as our working existing dns server.  I reversed them and all started working.
Thomas WheelerCommented:
ok good I figured it must of been a dns setting.
allenkentAuthor Commented:
NSLOOKUP helped me realize the DNS was not set correctly on exchange server #2.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.