False NDRs

Hi guys. Now-a-days I am facing a strange problem regarding to the mail
delivery. Some mails are originating from my domain with the sender as
valid users to the users of other domains and receive NRDs. Users are
complaining that they did not send these emails. My question is how
these emails are being generated and what I need to do to stop this.  In
our Exchange environment we have two Exchange clusters, one front-end
server, Antigen antivirus, ServerProtect antivirus and GIF anti Spam
S/W.

 

One of the NDRs is as follows: ( Our CEO did not send this email but NDR
shows the CEO is sender and he received the NDR!, lot of question marks)

 

Your message 

? To:? ? ? rafiq@xxxxxxxxxx

? Subject: Answer

? Sent:? ? Tue, 21 Feb 2006 15:30:40 +0600

 

did not reach the following recipient(s):

 

rafiq@xxxxxxxxxx on Wed, 22 Feb 2006 14:39:44 +0600

? ? The e-mail account does not exist at the organization this message

was sent to.? Check the e-mail address, or contact the recipient

directly to find out the correct address.

? ? <bestbd.com #5.1.1>

Reporting-MTA: dns; ourmailserver.domain.com

 

Final-Recipient: RFC822; rafiq@xxxxxxxxxx

Action: failed

Status: 5.1.1

X-Supplementary-Info: <bestbd.com #5.1.1>

X-Display-Name: rafiq@xxxxxxxxxx

 

From: "CEO" <CEO's <mailto:lpreichelt@xxxxxxxxxxxxxxxxx>  email ID>

Date: February 21, 2006 3:30:40 PM GMT+06:00

To: <rafiq@xxxxxxxxxx>

Subject: Answer

 

Hi!
Please read quickly.

Best Regards,

Osman Mahmud


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