php email script

["Jim Franz" <franz400@xxxxxxxxxxxx>]

Did Zend/IBM make avail a version of sendmail support sending email
to a server requiring authentication (user & pwd)
V5R4 system - a tiny model 800 
Running some php scripts in Apache
Do not have any tool stuff loaded (Zend or any others)
Trying to get a simple email out the door from a php based "contact" screen. 
Developer's php using a tool called Form2Mail, which came in Dreamweaver. It is looking for /usr/sbin/sendmail 
I need the simplest way to make this work or a similar tool for same effect. 
Customer will not commit to going forward till email works...
Email hosted by isp and requires authentication.
I know I have asked this before. I'm not the php developer, but 
I've got to make the iSeries work for this. No other server in network.
Zend and other php lists full of "try this..", "should work", and 
it works and doesn't work in the Zend Framework. Very Confusing.
Jim Franz