1. Envelopes are for sending flat, flexible things, like letters, cards, checks, forms, and other paper goods. Postcards are for short messages tha...

2. Envelopes: Write your address in the top left corner. Write the delivery address in the bottom center. Postcards: Postcards come in different fo...

3. A First-Class Mail Forever stamp costs $0.58 and goes in the upper right corner of the envelope. If your letter is heavier or bigger, or if you...

4. To send your mail, put your letter inside your mailbox and raise the flag (if you have one). If you have a cluster mailbox, drop it in the outgo...