Here are some helpful hints if you're sending the card through the mail:
- Square envelopes will require extra postage. Check with your local post office on the amount.
- The thickness of the envelope (with the card inside of it) must be between .007 and 1/4" thick. All envelopes must be between 3-1/2" and 6-1/8" tall, and between 5" and 11-1/2" long.
- Use a heavy weight paper but one that is lighter than cardstock (it is too stiff to fold). Avoid glossy papers and dark papers--they make it difficult for the machines to read addresses or attach bar codes.