Hello

I have Exchange 2003 SP 2 running on Windows Server 2003 SP 1.  I am
occasionally receiving non-delivery reports for users with the main body of:


"This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
/O=OURCOMPANY/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=JSmith"

and an attached .txt file that reads the following:

"Reporting-MTA: dns;frontend.ourcompany.local
Received-From-MTA: dns;mail.ourcompany.net
Arrival-Date: Tue, 6 Jun 2006 10:59:36 +0100
Final-Recipient: x-ex;/O=OURCOMPANY/OU=FIRST ADMINISTRATIVE
GROUP/CN=RECIPIENTS/CN=JSmith
Action: failed
Status: 5.1.1"

When the user who receives this NDR re-sends the message it sometimes goes
okay and sometimes doesn't until they try again the next day.  We have a
frontend server (frontend.ourcompany.local) which handles Webmail but doesn't
relay any SMTP traffic and a backend server that handles SMTP traffic and
mailboxes.  The server mail.ourcompany.net is a UNIX SMTP server that
receives mail for our domain and passes it on to the backend server.  What I
don't understand is why the NDR comes from frontend.ourcompany.local as most
NDRs come from the backend server. 

I have no idea why this message is occurring as the mailboxes are there and
the recipient is receiving mail okay.  It just seems to be the occasional
message not getting through.

I have noticed that when viewing the Global Address List in Outlook the
e-mail field for users who get the above problem contains the following (NOTE
the number after the mailbox):

"/o=Ourcompany/ou=First Administrative Group/cn=Recipients/cn=jsmith90175602"

I'm not sure why this is although we wondered if it was because when
creating these mailboxes we first did a 'Remove e-mail address' in AD Users &
Computers, and then 'Create Exchange mailbox'.

I am completely at a loss with this and would appreciate any help that you
could give me.

Thanks for your time.

OAL (apparently) 0x8004010F
Email rejection
Antivirus and Spam
Back-end Server
I'am running weboutlook I can't send any mails to a user in my com