Exchange 2003 error 5.1.1 Recipient does not exist - when receiving from other companies


The problem I got started as an occasionnal problem. Some companies or clients could not send us emails, as they got the error 5.1.1 The recipient does not exist on the specified server.

This became more of a problem this week as nearly 25-35% of the incoming emails does not go through and return to the sender with this notice.

We did some testing and found out that when users send us emails this does not work, but I can send them emails. If they hit reply on my email it will go through properly and work with no problems most of the times.

I am on Exchange 2003 with Windows 2003 server on an IBM Netfinity 5500 server.
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.


  How many exchange servers do you have ? Are there are any front ends ?
  Is that exchange server a domain controller ?
  If it's not try to go to that server object properties in ESM and see in Directory Access if you have a valid GC.

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
Is your recipient policy setup correctly?
DNS and SMTP working normailly?

What has been the latest change?

Last time it was rebooted?

matanguayAuthor Commented:
I only have one exchange server

here is my servers setup :

1. IBM Netfinity 5500 running W2003 server std
1.1 Exchange server 2003 installed and running on this machine
1.2 Backup domain controller also running on this machine

2. IBM Netfinity 5500 running w2003 server std
2.1 Primary domain controller installed and running
2.2 Primary DNS server
2.3 File server

3. IBM Netfinity 5000 running w2003 server std
3.1 Backup domain controller installed and running
3.2 Backup DNS server installed and running
3.3 Printer server

4. ... other app servers, not releavant

My recipient policy setup is standard and working properly
DNS and STMP working fine also

I rebooted it last week wednesday and I will perform and offline backup, then install Exchange 2003 SP1 tonight and will reboot it afterwards. Will see what happens.

Latest change is way back when installing a new server in the group (june 2004)

Thanks !
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.