Hi All: I've read through a few threads about PHP mail not working on IIS6, and I'm running into the same problem.
Server2003 Std sp2 / IIS6
SMTP service configured on default IP, and is working for VBS/.NET webpages.
PHP.ini has smtp "localhost", port "25" and "sendmail_from" set to a valid email address
I explicitly added connections for "localhost", "127.0.0.1", and the default IP in the SMTP service properties
I explicity added "relay" permissions for the same three.
I still can't send mail (nothing generated, no SMTP log activity)...are there any permissions I'm missing, or a way to debug what's failing?