What part of a business letter is this Mr T E Jones?

Mr. T. E. Jones could be part of any of several parts of a business letter:

• The inside address and salutation (greeting); the person that the letter is going to (the addressee).
• The subject of the letter; a name on the reference line or included in the body of the letter.
• The signature; the name of the person that the letter is from.
• The 'copy' line; a person who will receive a copy of the letter in addition to the addressee.