If you are sending a message to someone you don’t know, look up the recipient’s full name(s). Alternatively, contact the company and request the full name and spelling.

If you are exchanging several emails related to the same topic, it is not necessary to include a greeting on each new email. Think of the “back and forth” correspondence as though you were carrying on a conversation. When we carry on a conversation, we do not say “dear or hello” every time we speak.