Layout of a Business Letter — SPCC STD 11 Commerce — Question

Mailing Instruction: Most of the times business letters are sent through post. Some letters are sent through ordinary post and some are sent through registered post or Registered A.D. If letter is to be sent by air then the words “By Air Mail” is written on envelope. Over and above this letters can also be sent through speed post, courier etc. Authentic detail regarding the dispatch of a particular post is obtained from mailing instruction and it is placed either at the top or end of the letter. Foè.g: By Regd. A.D. Post OR By Courier OR U.PC. (Under Certificate of Posting) This mailing instruction should be written even on the envelope as per the rule of postal department.