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A first step for exim4 configuration

As a system administrator, I have experienced sendmail, qmail and postfix for mail servers.
Even after I started to use Debian, I continued to use postfix.

But default MTA for Debian is exim4.
And now that I am no loger a mail server's administrator,  I feel it's time to try exim4.

For several months, I didn't know how to understand exim4 configuration.
But finally found hint in /usr/share/doc/exim4/README.Debian.gz

 apropos exim

Well, I didn't imagine Debian specific configuration guides are in man pages.

man exim4-config_files

Still, I don't know exim4 configuration syntax, but I can setup a smart host for my laptop PC.
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