Mantis#2660. Thank you kindly, Ruud Lathrop for a patch that:

This patch adds the option of adding the email when you create 
a new user. This works in Gridmode as none Gridmode. This 
option is also added to RemoteAdminPlugin. With a new handler 
you can create a user with a email. 

1 files changed, 1 insertions, 1 deletions

diff --git a/OpenSim/Region/Communications/Local/LocalUserServices.cs b/OpenSim/Region/Communications/Local/LocalUserServices.cs
index c0887df..8649d61 100644
--- a/OpenSim/Region/Communications/Local/LocalUserServices.cs
+++ b/OpenSim/Region/Communications/Local/LocalUserServices.cs
@@ -72,7 +72,7 @@ namespace OpenSim.Region.Communications.Local
             }
 
             Console.WriteLine("Unknown Master User. Sandbox Mode: Creating Account");
-            AddUserProfile(firstName, lastName, password, m_defaultHomeX, m_defaultHomeY);
+            AddUserProfile(firstName, lastName, password, "", m_defaultHomeX, m_defaultHomeY);
 
             profile = GetUserProfile(firstName, lastName);