Often times the postmark date is thought of as the date the post office prints over the postage stamp on the outside of the envelope.
There are two primary ways a date is applied to a mailing. First, a date would be applied if the postage on the outer envelope is applied by a postage meter. The postage meter machine prints the postage on the letter in red ink and generally always has a date in it. Second, a date would be applied by the USPS when they "cancel" a live stamp. This cancel process occurs on every letter that has a first-class stamp on it.
Generally, there won't be a postmark date on a letter sent through LetterStream.com as we use a postal permit, also known as an indicia. For more information regarding a postal indicia, click here.
If you’d prefer a date is not printed on your letter, you are in luck as we do not generally put postage on the envelopes in a way that a date stamp is needed. On the other hand, if you really want a date on your letter, you could choose the option to have a live stamp added. Simply create the mailing within your account, then send us an email with the Job Number requesting we add a live stamp, and we’ll take care of that right away!