When sending a letter, how should I write the cover of the letter?

Write the postal code of the recipient in the upper left corner.

The first line reads:

Delivery address

The second line reads:

Recipient name

The third line reads:

return address

Write the sender's postal code in the lower right corner, and fill in the postal code of the recipient's area in the upper left corner of the envelope.

There are generally three lines on the envelope: the recipient's detailed address, the recipient's name and the sender's address.

Then fill in the sender's postal code in the lower right corner. 1: Write the zip code in the upper left corner.

2: Write the recipient's address on the first line.

3: Write the recipient's name on the second line.

3. The address+name of the sender is in the lower right corner.

4: Write the sender's zip code in the lower right corner.