I'm Sorry for sending this question second time. My Mail Server (based on NT) was crash and I unable to retrieve my previous mail. How to make a Firewall using Mandrake 5.3 or 6.0? a firewall with this features : 1. Intrusion Detection 2. User Authentication 3. Access Control 4. Mail Gateway 5. Address Restriction How to upgrade sendmail to 8.9.3? And how to configure that? Regards.