To make the examples on your screen match those in this book, we have elected to use V8 sendmail for the rest of this tutorial. If you are already running the latest release of V8 sendmail, you may skip this chapter.  Otherwise, you will need to get and compile V8. In this chapter we show you how to do just that. But don't worry. We don't intend to show you how to do a full installation. All you need is a runnable sendmail binary, and compiling one is generally pretty easy.
 You may still have to get the latest release and compare it to your system version to find out whether you really have the latest release.
Its distribution consists of two forms of tar(1) files, one compacted with compress(1) and the other with gzip(1):
sendmail.*.tar.Z compressed source tar sendmail.*.tar.gz gzipped source tar
* in each of the above represents the current version
number, such as 8.x.y, where x denotes a major release and y denotes a
minor release. Get only one of these two files; they contain identical
copies of the distribution. The
.gz form is smaller and
quicker to transfer with FTP.
zcat sendmail.8.8.4.tar.Z | tar xf -
gzcat sendmail.8.8.4.tar.gz | tar xf -
Once successfully unpacked, you'll find a new subdirectory
in the current directory. It has the same name as the source
distribution, but with the
removed and the first dot in the name turned into a hyphen:
Here, sendmail-8.8.4 is the directory that contains the source and documentation for sendmail. Change into that directory and look at its contents:
FAQ RELEASE_NOTES mail.local rmail
KNOWNBUGS cf mailstats smrsh
Makefile contrib makemap src
READ_ME doc praliases test