That part is known as the SALUTATION or GREETING.
An example of a greeting of a letter, also known as the salutation, is "Dear Sir,"
That part of the letter is called the salutation or greeting.
greeting
"Dear Seth" would be the greeting.
greeting
Caption is not typically a part of the format for a letter to the editor. The key components are salutation, greeting, inside address, body, and closing.
"Parents" is typically not capitalized in the greeting of a letter. It is only capitalized if it is used as part of a proper noun, such as "Dear Parents Association."
"Good morning" is considered a greeting or an interjection, not a traditional part of speech like a noun or verb.
greeting
There are six parts of a letter. There's the heading (return address), date, salutation or greeting, body, closing and signature line.
The body of a letter is the part between the greeting and the closing. It contains the message or "meat" of the letter. It is the reason for writing the letter and contains the main ideas that the letter writer wants to convey to the recipient.