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Unable to send out emails from web application



I am trying to send out emails from my web application.  I have a VPS package.  My application settings are as follows:


<smtp deliveryMethod="Network" from="">
<network host="" password="XXXXXXXXX" port="587" enableSsl="true" userName="" />


I have set up some code to send out an email confirmation if I receive an email from a contact form.  I am not receiving the email enquiries but sending out the responses.  The only time I get an email is if I put in the correct domain i.e.  


i've thrown an exception which says:  


Mailbox unavailable. The server response was: 5.7.60 SMTP; Client does not have permissions to send as this sender [LO2P265MB0432.GBRP265.PROD.OUTLOOK.COM]


Any ideas on how I can get this working?