Your Message Wasn’t Delivered Because Of Security Policies

Java Mail API can be used to send emails. For a mail to be sent, at the minimum the following need to present -

• Mail Server Host and Port [Mandatory]
• Sender email id [Optional, can be a dummy mail id]
• Receiver email id [Mandatory]

If the mail server is Microsoft Exchange, there could be a policy that requires sender authentication. It means that sender also needs to be a valid authenticated user. If a dummy mail id is used as sender, then MS Exchange would not let the mail be delivered.

In that event, the following articles explain how that can be disabled.

• Your Message Wasn’t Delivered Because Of Security Policies
• How to fix: "Your message wasn’t delivered because of security policies in Exchange 2007 and Exchange 2010" 

Note that the above settings need to be performed on the MS Exchange Mail Server. If MS Exchange Mail server cannot be accessed, then a valid sender needs to be used!