PHP 4.1.1 - Problems with popen

Can anybody please help me with the following problem ? I am trying to run a shell command via popen but nothing happens.... Here's an example: $fd = popen("/usr/sbin/sendmail -t ","w"); fputs($fd, "To: somebody@somebody.com\n"); fputs($fd, "From: anotherone@anotherone.com\n"); fputs($fd, "Reply-To: anotherone@anotherone.com\n"); fputs($fd, "Subject: Testmail\n\n"); fputs($fd, "Just a test.\n"); pclose($fd); It isn't restricted to sendmail, I can't run any program from PHP (not even a simple "ls"...). This is a list of items I checked so far: - safe_mode in php.ini is off, - the user PHP runs under (which is the same as the one apache runs under ?) CAN execute the commands when working at the shell (bash) - sendmail, ls - no problems... Is there any option I can turn on for logging what PHP does ? My box is running under Suse Linux 6.4, PHP version is 4.1.1., configured to run as an apache-module ( './configure' '--with-mysql' '--with-apxs=/usr/sbin/apxs'). Apache is version 1.3 I'm really frustrated, everything else works so please if you know of anything that could help me with my problem - let me know... kr, Joerg