Postfix and PHP

So, I'm going to follow the instructions in this: [url]https://www.afp548.com/Articles/mail/postfix.html[/url] And install postfix. But then I have to modify my PHP config file to use postfix instead of sendmail (which is the only reason I want to do this, so that certain PHP apps, like pMachine ([url]http://www.pmachine.com[/url]), can send mail.) By default it's: sendmail_path /usr/sbin/sendmail -t -i I assume I can almost just replace the sendmail part with postfix? Any pointers? (Maybe this will be clearer to me once I install postfix). Thanks!