any reason why mail() returns a false value?

FRUSTRATION. I figured it was time to upgrade PHP anyway since I was using 4.1.2 and then there's that Apache security problem, so I upgraded that too. And my sendmail problem is still present -- every time I try to call the "mail()" function, even with the simplest of arguments (the first three required arguments, all three of them simple string literals: mail('pricee@hhbrown.com', 'SubjectString', 'BodyText')), it fails. No email is sent, the return value of the function, when cast to integer, is zero, and I have thoroughly tested that sendmail works just fine. It is a RedHat 7.2 server, if that matters (though I don't think it does). I have done all of my compiling as root, and /usr/sbin/sendmail was definitely in my PATH. If I had any money, I would PAY for someone to explain to me what is going wrong. Thank you in advance if you can help me. Sincerely, Erik Price ---- Erik Price Web Developer Temp Media Lab, H.H. Brown pricee@hhbrown.com