Linux, Apache, Sendmail

ok I finally got Linux installed on my puter. I installed Mandrake 8.0, which by the way is no different than Redhat 7.0. anyway...

first thing is first, I want to have Apache configured to run only for local host. I have read the httpd.conf file and it is nothing like the windows version. I recognize a few things but it won't load anything, php, cgi.

Second, I was trying to setup my mail and I can receive mail but I can't send mail. It doesn't matter what I use for a mail program it won't work. I am trying to send an emial to a friend (yes I have 1 of those) :D and it says that there email is not a valid domain or something. I can send them in windows, but not Linux. I found out that sendmail was not installed, so I installed it. but it doen't seem to work. or if it uses it at all. I set my SMTP server to my ISP domain and it comes back with that error.

I am sure there is someone out there that is better at this than I so....
Parksie where are ya :)

I will take some advice by anybody else :D