Correct postage: Here is some advice on mailing your invitations. Before addressing your invitations, put together a complete invitation set with all your encloser cards and envelopes. Then bring it down to the post office and asked them to weigh it for you. Then you will know the exact amount of the stamp to place on the envelope. Also, at this time you may choose your stamps. The post office sometimes has wedding stamps. But it is a good idea to choose a stamp the does not have any color so not to distract from the calligraphy on the envelope.