Section 2.1, statement (b) of Unit 10 says, "Mamun begins the letter with 'Dear Hasib'. This is 'salutation'." Also, Section 3.1 instructs, "Begin the letter using a greeting or salutation, like 'Dear ...'"
Class 4 › English For Today › Chapter 9: 9 - 12 Unit › Topic: Parts of a Personal Letter
Aligned to the NCTB national curriculum.