Is there any reason I should upgrade to php 5 or should I continue to use php 4? Does php 5 have enhanced security or other benefits while running phpformmail? Are there any issues running the script with php 5? I ask after reading this article
thanks
matthew

As far as phpformmail
As far as phpformmail directly, there is no advantage. As far as indirectly... They just announced the end of life for PHP4 so some time in the future they'll stop releasing fixes for php4.
Short version is, phpformmail works with php5, I would recommend upgrading eventually.
Andrew M Riley