Proper Names are the Proper Choice
While sending E-Mail, take an extra few seconds to type out the recipients proper name - instead of just an initial like B or M. It has been shown that using just initials puts some people off. Chances are, they may not go ahead and read your E-Mail at all.
Take a few more seconds to include a greeting like "Hi Bob" or "Good Morning, Jim" and your E-Mail will be better received. Simple... but effective!