Recommend a secure PHP mail form?

Hi, I need a very secure mail form that prevents header injection spamming. I’ve found a lot of information about what lines of code to add to an existing PHP form, but I’m new to PHP and I’d be more comfortable finding a good form that’s already secure and learning to use it from there.

Can anyone recommend one of the many out there that’s especially easy and secure?

PHP Mailer is the way to go
http://phpmailer.sourceforge.net/