Zimbra Error Message

From: ****************
Sent: 05 May 2009 09:00
Subject: Undeliverable: Read: commande cheque cadeau
Error: This message could not be sent.
Subject: Read: commande cheque cadeau
To: *****************


I have a user who keeps on getting these error messages when sending an email from his Zimbra account. (see above)
The email address is correct and there is no attachment on the email.

I have tried updating the Zimbra connector with the latest connector to see if it resolve this issue.

But no luck

( Also is this the latest connector out now ??? )

Has anyone else come across this problem before with an Zimbra account generating these type of error messages ??

If so , do you know what is causing theses to generate and also how to resolve this issue.