Unlike most of the other templates, post card mailing templates has to do a lot with communication of information from a sender to an intended receiver. In such mailing templates, users are restricted to follow a certain pre-defined templates as prescribed by mailing standards. You can also see Postcard Design Templates. For example, there has to be a certain amount of space left in the center for the bar code to be stamped, the address of the recipient has to be written in the correct place along with a valid zip and contact number. These postcard templates are mostly designed and drafted in custom formats, and then printed on a post card mailing template.