need help with notify_no.c

[Christoph R]

I'm trying to get my cyrus-imapd-2.0.16 installation to call a php
script
on incomming mails.

I've added something like:
system ( "/notify.php user mailbox message" );
to the imap/notify_no.c but now sendmail always says cyrus exited with
EX_TEMPFAIL.
How can I get notify_no.c to call my script without EX_TEMPFAILING?

And is there a way to check how many messages are in the mailbox cyrus
is delivering to?
It would be nice if I could only call my PHP script for the first
message that is
in the mailbox.

Thanks.