http://www.sans.org/
The official site for the SANS Institute, an organization that provides security
training and information. This site allows you to subscribe to a mailing list that
provides routine digests of security matters.
Practical Unix & Internet Security, Third Edition
By Simson Garfinkel and Gene Spafford (O??™Reilly), this comprehensive book on
security that includes information about many versions of Unix. It contains
information about network security that is germane to sendmail administration.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
182 | Chapter 4: Maintain Security with sendmail
Other web sources
Any of your favorite searchengines can be used to find additional material about
computer security in general, email security, and sendmail security in specific.
4.10 Pitfalls
??? Th esendmail program is only as secure as the system on which it is running.
Correcting permissions and the like is useful only if such corrections are systemwide
and apply to all critical system files and programs.
??? Time spent tightening security at your site is best spent before a break-in occurs.
Never suppose that your site is too small or of too little consequence to be
attacked. Start out by being wary, and you will be more prepared when the inevitable
happens.
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