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SearchEnterpriseLinux: The Final Frontier: Hacking Sendmail

Nov 22, 2004, 11:30 (2 Talkback[s])
(Other stories by Nigel McFarlane)

"Common wisdom on Linux has it that recompiling the Linux kernel is the meanest test of a system administrator's skills. While it's true that messing with kernel modules isn't trivial, there's a higher peak: hacking sendmail's configuration file. This tip shows you how to ruin your mail system with ease.

"Sendmail, that crusty and ancient (but also bulletproof) mail program, relies on the /etc/sendmail.cf file. These days, that file is usually generated using a heap of macros, much as a piece of assembly code can be entirely coded in macros. You can, however, hack sendmail.cf by hand, as long as you bear all the consequences. In the end it's still a plain text file..."

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