In troubleshooting an e-mail router issue today, I needed some information about the xml e-mail router settings and when I Binged my question, I found this great article on the CRM Team Blog site that provided exactly what I needed. If you have a need to better understand the xml files associated with the CRM E-mail Router then this article should provide what you need.
Email router configuration XML file explained – Microsoft Dynamics CRM Team Blog
Donna Edwards 
The link to the Microsoft Dynamics CRM team blog about “Email router configuration XML file explained” does not work. Could you provide an active, existing link, please?
Thank you.
Done, thank you