Letter

1. Letter is a communication in the nature of current and personal correspondence addressed to a person transmitted by post with pre-payment of postage.
2. Every letter shall be posted in securely closed condition.
3. The weight of the letter shall not exceed 500 grams.
4. Every letter for transmission by post shall conform to the following maximum and minimum dimensions:

   Maximum dimensions:

   Form	Single Dimension	Combined Dimensions
   In roll form	800 mm	Sum of length and twice diameter: 1000 mm
   In other than roll form	600 mm	Sum of length, breadth and thickness combined: 900 mm

   Minimum dimensions:

   Form	Single Dimension	Combined Dimensions
   In roll form	100 mm	Sum of length and twice diameter: 170 mm
   In other than roll form	140 mm × 90 mm with tolerance of ±2mm	-

Letters in other than roll form

1. Letter in other than roll form shall be in envelopes of the following sizes:
   • Minimum: 140 × 90 mm
   • Maximum: 458 × 324 mm

   with tolerance of ±2 mm

2. Every envelope shall have the flap either at the top on back of the longer side or at right or left.
3. Every envelope shall be made of paper having thickness from 0.15 mm to 0.5 mm.
4. Surface of the envelope shall be levelled with uniform surface structure.
5. Every envelope shall be continuously closed on all sides taking care to avoid a residue of gum on the envelope itself and metal clips or staples shall not be used for closing the envelope.
6. Every envelope shall be made of minimum 70 Grams per Square Meter.
7. Every envelope shall be flexible enough to bend into "U shape".
8. Every envelope with window shall have sizes of window between:
   • 35-50 mm (breadth)
   • 80-125 mm (length)

   and the contents shall be placed in such manner that only address block which includes bar code shall be visible through window.

9. The following materials shall be used as window material:

   Material	Specification
   Glassine paper	35 Grams per Square Meter
   Cellophane paper	40 Grams per Square Meter
   Polyvinyl Chloride or Biaxially Oriented Polypropylene	15-micron thickness

10. Window positioning requirements:
    • Distance of left edge of window from left edge of envelope: minimum 15 mm
    • Distance of top edge of window: minimum 40 mm
    • Distance of bottom edge of window from bottom edge of envelope: minimum 15 mm
11. Logo and name of the sender's company may be written on top left corner and stamps or frank impression on top right corner having gap of minimum 10 mm from address block of recipient.
12. Barcode requirements:
    • 15 mm shall be left for bar code printing at the bottom of envelope
    • 5 mm quiet space around 2D barcode or Quick Response Code shall be provided
    • Sender's logo size shall not exceed 25×50 mm in size
    • 2D barcode or Quick Response Code shall have minimum size 18×18 mm
13. The size of printed bar code or digital code along with quiet zone shall be kept minimum 60 mm in length and 10 mm in breadth in a window of envelope and shall be clearly visible.
14. In case of infringement of the conditions mentioned in regulation 87 and subregulation (1) to (13) of regulation 88 of Post Office Regulations, 2024, the letter shall be charged with double the postage and any postage paid on it shall be taken into account in assessing the charges.
15. The discount and value additions to the customers for letters may be specified by administrative instructions in accordance with the norms determined by the Director General from time to time.
16. The rates of postage chargeable on letters shall be as mentioned in Table I of Schedule I of Post Office Regulations, 2024.