Error sending meeting invites on Outlook 2003

Hello Experts,

There is one user on my company who has tried to send a meeting invite to some people on DL and received an error message.  
Your message did not reach some or all of the intended recipients.

      Subject:             xxxxx
      Sent:                 xxxx
The following recipient(s) could not be reached:

      xxxxxxx   on 11/2/2008 1140 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.
            <exchange server #5.2.1>

The receivers are part of a Distribution List, but everyone else on that DL has no issues.

Could anyone point me on the right direction

Thanks in advance
Jerry SeinfieldAsked:
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The email system that the user is on thinks your email is spam so it is rejecting it. Talk to the recipient and ask them to put your domain on a white list (allowed to receive emails from you).
Jerry SeinfieldAuthor Commented:
Hi David,

This issue is related to intermal mail flow, I mean,  an internal user sent an email to an internal Distribution List on the same domain, Some users from the DL were able to receive the email, but others rejected the email.

Any ideas?
OK - sorry.

Does an ordinary email to that address get rejected or accepted? Could it be that the email address has been entered incorrectly or changed? Or that the mailbox is full.
You can test this by expanding the distribution list  in the 'To' box and then deleting all teh other email addresses

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