It's easy to send mail from PHP scripts. For it to work you still need the right configuration in php.ini, however. If you run PHP on Unix or on Windows with a local mail server, you might want to take advantage of that server.
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The relevant setting is in the [mail function] section of php.ini, and is called sendmail_path. It should be assigned the path to sendmail, typically /usr/sbin/sendmail or /usr/bin/sendmail (but check your system to get it right).
Thus your configuration might look like:
[mail function]
sendmail_path = /usr/sbin/sendmail
If you use a different mail server, use its sendmail wrapper (var/qmail/bin/sendmail for qmail, for example).
