When addressing an envelope, the placement of the addresses is generally as follows:

• Recipient's address: Write on the front of the envelope, centered or slightly towards the bottom right area, but not too close to the edges. The recipient's full name, street address, postal code, city, and country (if international) should be included. This is the main address the mail is being sent to

• Sender's (return) address: Typically placed on the front of the envelope in the top left corner or on the back flap of the envelope. This address is important in case the mail cannot be delivered and needs to be returned to the sender

• Postage stamp: Affix the stamp in the upper right corner of the front side of the envelope

Additional details:

• Keep at least 15 mm distance from the left, right, and bottom edges, and about 40 mm from the top edge when writing the recipient's address

• Write addresses parallel to the longest edge of the envelope for clarity and proper handling by postal services

• Use clear, legible fonts and avoid decorative styles to ensure readability

In summary, the recipient's address goes in the center or bottom right area on the front, the sender's address goes in the top left corner on the front or on the back flap, and the postage stamp goes in the top right corner of the front of the envelope.