We believe that leaving the system should be as easy as using the system. Here is the github code that will allow you to redirect your custom domain and your emails without phishing protection if you choose to leave. 

No vendor lock-in, just happy customers. 

https://github.com/duocircle/phishredirector

In order to use the GitHub instructions you will need both the Public ID and Shared Secret values from your PhishProtection domain configuration(s).

To obtain these for a domain, open the PhishProtection administration interface through the web via your DuoCircle customer portal.

Select 'Settings' in the top menu then click 'Company' in the drop-down list to take you to the Company information screen.

Once there, you will be able to see the Public ID and the Shared Secret values in the Details list.  Click the icon on the right side of the Shared Secret field to see the text of value which is hidden by default for security reasons.