> Can anybody point me in the direction of a document or place where I could find information about setting up a >solo Linux Debian server running spamassassin as a gateway spam filter that sends the mail along to an exchange server?
This can be confusing to those that have never done this before. What you need is postfix to receive the mail, then for it to pass onto spamassassin to scan it for spam. If it passes, then to forward it to exchange. I can't promise this will be a good how-to but it looks good; take a look. http://www.debuntu.org/postfix-and-pamassassin-how-to-filter-spam
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