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Chapter 29. Creating a Mail Server > Sendmail Configuration

Sendmail Configuration

Setting up Sendmail is an interesting experience. Although it might appear that the main configuration file /etc/mail/sendmail.cf is the central setup point, it is and it isn't. The Sendmail configuration file is generated by a series of macros run by the m4 macro processor. By adding very simple directives to the macro files, users can create extremely complex configurations. The final output is the /etc/mail/sendmail.cf file, but some of the most useful configuration options are specified in the macro files before sendmail.cf is even generated.

Generating sendmail.cf

You've already seen a very basic change that must be made to the /etc/mail/sendmail.cf file to accommodate the Mac OS X file system. Let's backtrack a bit and see how sendmail.cf is created and can be fine-tuned using m4 macros.


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