configuring php.ini SMTP server in OS X 10.3.9 / PHP4


I'm sorry.. I'm sure this has been covered somewhere before but I have searched and searched and couldn't find it.

Could someone tell me how to edit my php.ini file to enable it to be able to send emails via my SMTP server ?

All I see in my php.ini file is this:

[mail function]
; For Win32 only.
SMTP = localhost

; For Win32 only.
sendmail_from =

; For Unix only. You may supply arguments as well (default: "sendmail -t -i").
;sendmail_path =

BUT.. I'm running OS X.. this stuff looks like it's for Windows.

+, I need to set a login/password otherwise my company's SMTP will not send the mail.

Any ideas anyone ?