We're trying to send messages to a distribution list from outlook. The people on the list are all mailboxes in the same domain as the sender on the zimbra box.

this is what comes back:

Subject: Undeliverable: Out of Office Notification

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

Subject: Out of Office Notification
Sent: 5/25/2006 10:56 AM

The following recipient(s) could not be reached:

'john doe' on 5/25/2006 10:56 AM
None of your e-mail accounts could send to this recipient.

'jane doe' on 5/25/2006 10:56 AM
None of your e-mail accounts could send to this recipient.

'do ho' on 5/25/2006 10:56 AM
None of your e-mail accounts could send to this recipient.

'joe blo' on 5/25/2006 10:56 AM
None of your e-mail accounts could send to this recipient.
.
.
.
for each user

They are having a lot of problems with contacts syncing between zimbra & outlook. Does anyone have suggestions?

Thank you