On Sending Invitations Gather your lists of invitees before you order the invitations. It's much more expensive to re-order than to order more than you need at the beginning.
Correct postage is determined by weight and size.
If sending different enclosures to differing groups of people, take an example of each. Remember, postage to foreign countries is higher. And, if you are sending invitations to other countries, do not pre-stamp the response envelope. U.S. postage can only be used for mail originating in the U.S., territories or through the armed services.