Outlook 2010 Undeliverable Email Errors over Exchange 2003

  • Thread starter Sheetal J
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Sheetal J

Hi Everyone,

I have Outlook 2010 installed and our company is still using Exchange 2003. I find that when I try to send certain emails to others on our Exchange 2003 Server through Outlook 2010 I get this error message:

Your message did not reach some or all of the intended recipients.
Subject: RE: Test
Sent: 02/11/2010 11:37 AM

The following recipient(s) cannot be reached:
FirstName LastName on 02/11/2010 11:38 AM
The message reached the recipient's e-mail system, but delivery was refused. Attempt to resend the message. If it still fails, contact your system administrator.
<MLBMAIL.ourdomain.com #5.2.1>

However when I use Outlook Web Access I am able to send emails just fine. What is the issue and how could we fix this?
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