How to best allow an external network computer hosting an Application to trigger email Using OnPremise Exchange Server 2013

Hi All,

How to allow a computer installed with application to trigger email in the following scenario

1. The app server is hosted outside the corporate n\w (Hosted in some vendors Cloud n\w)

2. We are running exchange 2013 CU5

3. App vendor want to use our corporate exchange server IP / URL in their App & trigger email

4. The email ID should be in our corporate email ID format - ex: abc@domain.com

Regards,

Manju

Manju Gowda