We use external users to send critical email to external users. These emails are created by systems that connect to gwia. To date we have had no conflicts. An example conflict is dispatch@abcairline.com, dispatch@defairline.com and dispatch@higairline.com. When I try to and a Preferred EMail ID I get "An error occurred modifying and attribute value. The email address dispatch@defairline.com conflicts with an allowed address for and existing user. I tried creating new external post office, and even a new external domain. Set visibility to none and never sync. GrpWise 8.0 hp1. Any work arounds would be appreciated.