> We use a MTA package called Extremail (http://www.extremail.com) and I was > wondering if SpamAssasin is compatible with it.
Did you check their forums at http://extremail.monsterserver.de/main.php ? They have a forum dedicated to integrating anti-spam products with their server, although it requires a login before you can view any posts, so I don't know if SA is discussed in there. HTH, St-