[UPHPU] PHP Email through IIS

[Mike Mackrory]

Hey Guys,
 
Here's my situation...  I'm trying to enable an app to send emails via an
SMTP Server.
 
I have php.ini setup with the ip address of the server, and I'm using the
mail  function to send the message.
 
My php.ini settings are:
 
[mail function]
; For Win32 only.
SMTP = 172.16.1.2
smtp_port = 25
 
; For Win32 only.
sendmail_from = administrator at xxxxxxxx.com
 
It appears that the code runs perfectly, but the I get thie following
message back, which I'm assuming originates at the SMTP server...
 
PHP Warning: mail() [function.mail]: SMTP server response: 550 5.7.1 Unable
to relay in C:\Inetpub\wwwroot\email_test.php on line 6 
 
Has anyone had any experience with this?  Obviously not using a windows
environment would be the right answer, but I'm not the one who gets to make
that decision.
 
The network admin I'm working with is wondering if I need a password or
anything.
 
Thanks!
 
Mike