problems with imap_mail()

I'm having problems trying to get the imap_mail() function working. I have the imap dll extention loaded up, and all of the other imap functions work just fine.. open, close, check, popen, etc. But when i try to use imap_mail, one of the more important functions, it spits out at me. "Warning: imap_mail() is not supported in this PHP build in c:\program files\apache group\apache\htdocs\test.php on line 20 " I'm running php 4.1.1 as a module for apache 1.3.22 on a win2k pro box. I've tried to use the regular mail(), but that's been giving me problems as well, but of a different sort, which I can work around, but would like to get the imap functions working so that I can make a couple of other scripts. Jeff