Simply over-communicating ("we say everything seven different ways, seven different times"), isn't a communication strategy, but that's the route most organizations take. An effective strategy cuts through the communication noise by matching messages to the right channels, at the right frequency.
You can think about your strategy as a communication hierarchy. Send only the most important information through "push" channels like email, and put the extra infromation you're not sending via email in "passive" channels, like a physician portal.
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Imperative #2: Curate physician-centered content