Most people start their email messages with the recipient’s name. Example: “Maya, I really enjoyed meeting you.” But it sounds more personal if you use it at the END of the sentence: "I really enjoyed meeting you, Maya.”
When you have something really important to convey, use their name in the MIDDLE of a sentence to make that particular point jump out. Instead of just telling Chuck that “It is crucial that you come to the meeting,” drive it home by writing, “It is crucial, Chuck, that you come to the meeting.”
A final note: It's super warm and fuzzy to put their name as the final word in the message. Hearing their own name last is more pleasurable (and original) than “Sincerely,” “Best” or “Thanks.” Close your email with the “sweetest sound in the English language” to them–which is, of course, their own name.
Of course, don’t overdo their name – once or twice is per message is enough!