432 votesJonathan Yergo commented
For the love of all that is holy, please implement this feature, Microsoft! This is absolutely necessary for environments with multiple domain aliases assigned to each user, and where DirSync/Azure AD Connect is enabled. Resorting to manual configuration or complicated PowerShell scripts is ridiculous and doesn't scale.
At least providing an easy to use utility or application to run on a DC to essentially handle email address policies would be just as good! Installing Exchange to JUST handle this portion is not acceptable - not worth the licensing costs or overhead!