Characters that are valid and even desirable in the name of a user, group, or resource might not be valid in an email address. Such invalid characters include spaces and certain accented and special characters. (Providing a definitive list of such invalid characters is beyond the scope of the GroupWise product documentation.)
In the names of users, groups, and resources, use underscores (_) rather than spaces as separators between words in order to facilitate addressing across the Internet.
When an object name includes any character that is not valid in an email address, that object cannot receive messages. For such an object, you must set up a preferred email ID in order to ensure that it has a valid email address.