If you follow Domain Driven principle, Order is a domain object but Email Sender maybe is a service ( different from Domain Service ) so you can’t use it in your model.
Other times I think of services as little classes that don't represent a particular person, place, or thing in my application, but that tend to embody processes. Domain services usually fall in this latter category. They tend to be named after verbs or business activities that domain experts introduce into the Ubiquitous Language
http://msdn.microsoft.com/en-us/magazine/dd419654.aspx#id0090088 - goes on to describe in contrast how application services perform mapping between layers or other modules
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