Your message did not reach some or all of the intended recipients

When users send messages to some addresses the following error is returned

Your message did not reach some or all of the intended recipients.

The following recipient(s) could not be reached:

      "destination e-maill"' on 10/30/2008 10:17 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <KTPO04.ktpo.ops #5.7.1 smtp;550 5.7.1 Client host rejected: cannot find your hostname, [our e-mail server address]>

We use Exchange 2003 on a MS Windows 2003 SP2 server
LVL 1
ktpoitmAsked:
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.

EfrenMCommented:
0
MobiNet-caCommented:

This might be a reverse DNS issue. The receiving server looks up the IP address of the sending SMTP server to check if it has an associated hostname value. If a DNS record comes back for that IP address the receiving server  then tries to lookup the IP information of that DNS record to confirm that it has a valid IP record.

nslookup - 123.123.123.123
returns - someserver.yourdomain.com
nslookup - someserver.yourdomain.com
returns - no valid address

Try that lookup sequence with your IPs and hostnames to see if the IP <-> HOSTNAME <-> IP records all exist.
0

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
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
Outlook

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.