Microsoft techNet Security - Product Security Notification. Instructions on how to join the mailing list for Product Security bulletins notification.

Firewall-wizards is a high-quality fully moderated firewall and security mailing list.

Focuses on Linux and Redhat related security information specifically the Linux-security and Redhat-watch-list lists.

Forum on risks to the public in computers and related systems.

Mailing list concerning DCS and SCADA Security

Website run by Fyodor of the NMAP project, a collection of security lists.

Macintosh security mailing list for advisories, patches, and alerts.

Location of various security mailing lists pertaining to exploits, hacking tools, and others.

Mailing list aggregator offering a selection of security lists to monitor.

Dedicated to the history of the early 'Security Digest' archives, from the Unix 'Security Mailing List', through the Zardoz 'Security Digest' to the Core 'Security List'.