Index

HINT: Using ClearOS as a SPAM filter.

1. Install as gateway
2. configure port forwarding for everything BUT port 25. (don't forward that to your internal mailserver)
3. Server→ Mail Scanning→ Antispam → Enable/running
4. Server→ Mail→ SMTP Server → Make sure your “Primary Domain” isn't one that your actual mail server is hosting.
5. Server→ Mail→ SMTP Server → “Mail Forward Domain List” = Add the IP of your internal server and the domain(s) that it's responsible for.