Control Bounced Emails

[lynchdog]

How do I control bounced emails from removed employees.

"The following recipients did not receive the attached mail. Reasons are listed with each recipient:

<X-EMPLOYEE@imagedatallc.com> X-EMPLOYEE@imagedatallc.com
MSEXCH:IMS:IMAGE DATA:IMAGEDATA-DOM:IDEXCH01 0 (000C05A6) Unknown Recipient

The message that caused this notification was:&quot;