There are a variety of sizes of post cards being used in marketing today. Most economical size post card to print and mail through standard postal services is the 4.25x5.5 postcard. It qualifies for a postcard stamp in his economical to print. This is a great postcard you need to mail large quantities to your mailing list and get important information to a large number of people.
The postal service has a new type of mailing Called the EDDM. This is a large postcard that mailed with very inexpensive postage.. It must be mailed to every person on a specific Postal route For more details about EDDM click here.