For security reason, never show or send E-Mail with primary alias, some time people when it urgent and they don't have time to check what they do, need advertisement from E-Mail send system to advice them about, for security reason, never chair E-Mail with contact even if you are sure about the contact that you going to contact via E-Mail, via Skype, via Xbox or via any platform of communication. Never show or shear the primary alias. Here Microsoft have to improve and secure all this services have to do with primary alias.