good news is— Exchange Server 2007’s shiny new Content Filter Agent (or
IMF v3 if you will) has whitelists! You can add SMTP addresses and
domains to the Content Filter configuration, and have messages from
these senders and domains bypass the Content Filter Agent. However, you
need to resort to the Exchange shell (EMS) to manage it.
Use the following shell command to add sender SMTP addresses to the BypassedSenders list:
Set-ContentFilterConfig -BypassedSenderDomains somedomain.com,someotherdomain.com