Which part of a formal letter contains the main message or content?

• There are six parts in a formal/ official letter:

1. Heading: Date, Designation (পদবী) & Address of the Recipient.
2. Salutation (সম্বোধন) : যেমন - Dear Sir/ Madam.
3. Body (মূল বক্তব্য).
4. The Subscription: যেমন - Yours faithfully/ I remain, Sir.
5. Signature of the Writer.
6. Superscription: Detailed Designation & Address on the Envelope.