Red Hat 9.0 and Slackware 9.0 both use sendmail for mail delivery, as do older versions of many other Linux distributions. If you want to run sendmail, you can use it with distributions that normally use other mail servers, but doing so requires removing the standard mail server and installing sendmail. Unfortunately, sendmail configuration file locations and names vary somewhat from one distribution to another, so you must know where to look to find these files. Once found, you can change many sendmail options, such as the addresses the server considers local and relay options.
Note Many programs rely on the presence of an executable file called sendmail. For this reason, mail servers other than sendmail usually include an executable called sendmail, which is often a link to the equivalent program file for the other mail server.
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