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I would like a good overview on sendmail:<br />
<br />
What sendmail is?<br />
What is it used for?<br />
Where do you set it up?<br />
<br />
Please provide a good explanation and simple basic help links.
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I would like a good overview on sendmail:

What sendmail is?
What is it used for?
Where do you set it up?

Please provide a good explanation and simple basic help links.

AIX - Sendmail

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.