I neede a way to create a whitelist in Exchange 2003. Apparently the support for whitelisting is not very good. Here are some options:

1. Global Accept List

You can add the IP och a “Safe” mail server.

http://www.exchangeinbox.com/article.aspx?i=44&t=3&p=2

2. Custom Weighting

You can add an XML file containing rules for changeing the SCL value based on SUBJECT or BODY

http://www.accendo.co.uk/blog/?p=4

3. White list Recipients (Note: Not Senders)

You can add certain recipients for whome you will not filter email.

http://support.microsoft.com/?id=912587