Do I need to do some thing more?

You need to have a smtp server.
Defautl is local smtp : sendmail on Linux, none on windows.

And, how do I configure to send email with google apps email? (they need SSL)

email finctionality is not able to use SSL "connected" smtp server. Maybe it can be an improvement.

If I use our email, for example abc@mycompany.com to be email of the system (to send notification email), how do we do? (this is not SSL required)

I found in parameter.php (in tools & files > config), but there is not place for me to input user name & password for this email account (for the system to log in and use this mail box to send)

Do I need to do some thing more?

You need to specify a smtp server (smtp host).
Either you have one on your own, or you need to use one from your provider.

I've try but it doesn't work.
(I use smtp server: smtp.gmail.com)

gmail smtp server requires ssl identified connection, what is not possible through default PHP mail function.
try smtp.free.fr

Hi babynus,

Do I need to register an email account on www.free.fr before I update smtp.free.fr?

Thanks for your help.

Well, I not sure wether you need or not.
What is sure is that you don't need to provide an account.
Neither must be sender in free.fr email domain.

When I test with smtp.free.fr, in most cases, I am behind my FreeBox.
But I think I had some tests on other networks where it worked (but not sure).