difference between standard and first class mail
The terms bulk mail and standard mail are interchangeable. They both refer to the Standard Mail class. Advantages of standard mail are significantly lower postage costs versus First Class mail. In order to send your mail at Standard Mail rates you must have either 1) 200 pieces or 2) 50 pounds of mail. The pieces must be uniform and of a non-personal nature (ie. advertisements, catalogs, solicitations, newsletters).