Using mail() with w2k/IIS5 with SMTP feature

Hi! I'm trying to insert sending of a "notice-mail" whenever someone submits to a buletinboard. I've checked the SMTP service with a mail-client, and sending mail works fine. When I try to send via the mail() function in my php script, it fails with the following warning: "Warning: Failed to Receive in L:\root_www_leilighet\app_to_top_of_guestbook.php on line 32" wich refers to the line where I use "mail($email_recipient, $email_subject, $text);" Should I impress a certain format to my variables contents? My php.ini looks like this: [mail function] ; For Win32 only. SMTP = 10.0.0.2 ; for Win32 only ; For Win32 only. sendmail_from = smtp_php@heimen.no ; for Win32 only Can anyone please help? Regards, Georg Herland