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CHAPTER 26 Mail
26.5 Security
Sendmail is a very complicated package and over the years a number of intentional and unintentional security holes have been found in it. If you are running with the vendor supplied sendmail, most likely, you have an insecure version. This could result in someone cracking your system and gaining root access. Your vendor probably has a patched version available. Make sure you're running with the patched version, or the latest BSD version. The latest BSD version is 8.7.5. You can get this via anonymous ftp from: ftp.cs.berkeley.edu in /ucb/sendmail.
Unix System Administration - 8 AUG 1996
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