How to write the format of the envelope appearance?

1. Fill in the recipient's area code in the upper left corner of the envelope.

2. Fill in the address and name of the recipient in the middle of the envelope, and it is best to write the contact information.

Stick a stamp on the upper right corner of the envelope.

4. Fill in the postal code of the sender's area in the lower right corner of the envelope.

Write the address, last name and contact information of the sender in the middle of the envelope.