Risks Digest - Forum on risks to the public in computers and related systems.
NTBugtraq - The source for bugs, exploits, and vunerabilities in Windows NT versions 3.5 - 4.0
NT Security Alerts and Digest Newsletter - Windows NT security alerts from several known resources. When new problems arise, alert is sent out.
Check Point FireWall-1 discussion - Searchable archives of Check Point FireWall-1 mailing list and online discussion
InfoSec News - Privately-run medium traffic list that caters to distribution of information security news articles.
Bugtraq - Bugtraq mailing list archives of UNIX, NT, Win95, Novell, Mac, etc. bugs and exploits.
Firewall and Security Mailing Lists - List of mailing lists dealing with computer security and firewalls.