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Debian: Security Announcements - http://lists.debian.org/debian-security-announce/
Security announce mailing list for Debian Linux.
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Microsoft - http://www.microsoft.com/technet/security/bulletin/notify.mspx
How to subscribe to the (free) e-mail notification service that Microsoft uses to send information about security of Microsoft products.
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Gentoo Linux - http://www.gentoo.org/security/en/index.xml
List of security announcements and information on how to sign up to security mailing list.
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OpenBSD - http://www.openbsd.org/mail.html
All OpenBSD mailing lists, including security alerts.
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Sun Security Information - http://sunsolve.sun.com/pub-cgi/show.pl?target=security/sec
Includes subscription instructions for the Sun security-alert mailing list. Subscribe to this list to be alerted when security patches are released. Very low volume.
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Red Hat Linux - http://www.redhat.com/security/updates/advisory/
Notifications and advisories. Security mailing list subscription is on this page.
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Adobe - http://www.adobe.com/devnet/security/security_zone/notification_service.html
Security alert notification service.
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HP - https://h30046.www3.hp.com/subprofile.php?jumpid=in_SC-GEN__driverITRC®ioncode=NA&langcode=USENG&subs=ITRC
Subscribe to HP Security Bulletins. Requires registration.
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NetBSD - http://www.netbsd.org/cgi-bin/subscribe_list.pl?list=tech-security
Security mailing list subscription.
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Apache - http://www.apacheweek.com/aw/email
Apache Week, includes security alerts.
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SuSE Linux - http://www.suse.com/en/private/support/online_help/mailinglists/index.html
All SuSE Linux mailing lists, including security alerts.
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Oracle - http://www.oracle.com/technology/deploy/security/securityemail.html
Oracle security mailing list. Requires registration.
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