Sending Mail with PHP.

Hi all, I've been using PHP over the last year now, and have become quite capable with the language, but, there is one function/feature that I have yet to try/use, and that is the mail() function. I am gonna start to learn it to night, but was wondering if there was any adjustments that were needed within the php.ini file before I actually start writing up the code. The function seems staright forward enough to execute, but are there any other things i should know that is required to send email via PHP scripts. I am using AOL to send and recieve emails. Tryst