jbobst
asked on
Outlook 2003 can't send reply messages: error 550 undeliverable
We just switched over to new Windows 2003 servers and Exchange 2003. I have started the process of converting our users to Outlook 2003, but we came across a problem. The Outlook 2003 users are not able to reply to any messages from people outside of the company. They can send new emails to the outside world just fine. When they send a reply message, they immediately get a response email from "system administrator" with the following information:
Your message did not reach some or all of the intended recipients.
Subject: RE: test
Sent: 5/11/2005 11:21 AM
The following recipient(s) could not be reached:
"*******" on 5/11/2005 11:21 AM
550 not local host ******.com, not a gateway
Our Outlook 2000 clients can replay successfully to any email and don't seem to have this problem.
(I used ***** in the email body, where the email address and mail domain are actually listed)
Your message did not reach some or all of the intended recipients.
Subject: RE: test
Sent: 5/11/2005 11:21 AM
The following recipient(s) could not be reached:
"*******" on 5/11/2005 11:21 AM
550 not local host ******.com, not a gateway
Our Outlook 2000 clients can replay successfully to any email and don't seem to have this problem.
(I used ***** in the email body, where the email address and mail domain are actually listed)
ASKER
I don't have any SMTP connectors setup, and I don't know what a smart host is. (I am not sure what an SMTP connector is either, but I see a folder group icon in my exchange server, and it is empty)
I did change a setting in my Outlook 2003 however. I put a checkmark in the "my outgoing SMTP server requires authentication" box, and now things seem to be working. I don't really understand what that means, but I didn't have to do this with Outlook 2000.
I did change a setting in my Outlook 2003 however. I put a checkmark in the "my outgoing SMTP server requires authentication" box, and now things seem to be working. I don't really understand what that means, but I didn't have to do this with Outlook 2000.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Simon.