The SPAMfighter Exchange Module uses the following ports: Anti-spam community: UDP/TCP 2409: servers.backend.spamfighter.com SEM Administration page (and SEM client toolbar for Outlook): TCP 5000 SEM communication between the Administration page and the server: TCP 5001 License and update: TCP 80 to: http://login.spamfighter.com http://update.spamfighter.com http://download.dk.spamfighter.com http://download.spamfighter.com