qmail-inject: fatal: read error

[Warren Brundage]

Hi, When I try to use PHP to send mail through qmail I get a "qmail-inject: fatal: read error".  I have posted this to the PHP lists but I guess nobody there understands qmail well enough!   I have tried putting both the default sendmail -f and qmail-inject into the php.ini file and I have the appropriate qmail links set up.  I am not sure if this is some kind of permission error or if PHP is trying to pass through information that qmail-inject can't understand.  Is there some way to trouble-shoot this?  I know that PHP does work with qmail, just not for me!  Does anyone have any answers???