Even if you call someone by his or her first name in person, letter format requires that you use a courtesy title and the reader's last name in the salutation.

Name: Even if you call someone by his or her first name in person, letter format requires that you use a courtesy title and the reader's last name in the salutation.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

In informal or personal letters, it is acceptable to use the recipient's first name in the salutation if you are on a first-name basis with them.

Even If You Call Someone by His or Her First