Courtesy titles must always be used in the salutation of a letter.

Question

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While it is customary to use courtesy titles (such as "Mr.", "Ms.", "Dr.", etc.) in the salutation of a formal letter, it is not always necessary or required. In some cases, using only the recipient's name may be appropriate (such as in an informal or personal letter). However, it is still important to consider the context and audience of the letter when deciding whether or not to use a courtesy title.

Courtesy Titles Must Always Be Used in the Salutation of a Letter