Ok. Here is the exact problem. It is very simple. Imagine we work in
the same company, I send an email to you ( and you only ) addresed in
the "to" field. I then get an email from the administrative account
saying that the email could not be delivered to another user ( who I
did not send the email to ). That is it in a nutshell.
There are no mailing lists involved, all of the emails are being sent
to individual addresses, and the correspondance occurs internally
only. The user is not in AD (i.e. the account has been previously
deleted). Th email server is exchange 2000, and we use the default
filtering in ESM, aswell as a third party SW "XAMINE".