Error message in email router
401 - unauthorization error in email router error
troubleshoot email router
http://blogs.msdn.com/crm/archive/2009/01/08/troubleshooting-the-microsoft-dynamics-crm-e-mail-router.aspx
http://blogs.msdn.com/crm/archive/2008/12/23/update-rollup-1-for-microsoft-dynamics-crm-4-0.aspx
Regards,Imran