Thad(deus) Bogner

`apt-get install -qq -y postfix postgrey postfix-policyd-spf-python` will fail for postfix & postgrey since postfix-policyd-spf-python does not exist. This breaks the mail server section, can be fixed by installing postfix...

Change domain to lowercase so that it's consistent throughout. Some directories were lowercase and others configurations weren't and it wasn't able to match correctly.

Spelling change