Need Configuration Settings
<p>I have developed flex based application with php. My client is using Windows 2003 Server. I installed IIS Server and Php Installer into my client machine. I configured php into IIS Server and its working fine.</p>

<p>Query: 
I wrote a mail code for sending mail to my application user. My client is using internal mail server. I want to send a mail through my application. I used smtp.gmail.com into my application and Its working perfectly. But when I am using client internal mail server. It is showing below mentioned error.</p>

<p>"Failed to set sender [SMTP: Invalid response code received from server. (Code: 554, response: Mail from mail-id rejected for policy reasons.]"</p>

<p>Please help me out to solve this query. Thanks in advance.</p>
