Miscellany
Some odd items that are set up on a per-client basis on non-Linux systems are set up on a systemwide basis on Linux systems. For instance, things such as the address of the ISP's news server and the masquerading of outgoing mail (making it look as though it's emanating from the ISP, and not from your personal machine) are typically handled on a systemwide basis. This is not necessarily a bad thing; this way, you can set or change one setting and all the applicable client programs you use will utilize the new setting.
By far, the most popular item set in this manner is the domain used for outgoing email. Chapter 28, "Email Clients and Servers," addresses configuration issues and schemes used with sendmail; the m4 configuration system ...
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