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sendmail X is a message transfer system that has been designed with
these main topics in minds:
- security
- reliability
- efficiency
- configurability
- extendibility
sendmail X consists of five main modules of which only one runs
as root:
- mcp: the main control program is similar to inetd(8): it starts
all other sendmail X modules and watches over their execution.
mcp runs as root in order to bind to port 25 and to change the
uid of the processes it starts.
- smtps: the SMTP server receives e-mails.
- smtpc: the SMTP client sends e-mails.
- smar: the address resolver provides lookups in various maps including
DNS for mail routing.
- qmgr: the queue manager controls the flow of e-mails through the SMTP
servers and clients.
WWW: http://www.sendmail.org/
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