Can I place permit mail in an USPS drop box?
No. To enter a mailing using a permit, the mailing must consist of at least 200 identical pieces. USPS forms have to be filled out with the mailer’s name, permit number, date, number of pieces, cost per piece and total postage to be charged to the account of the permit number. The mailing must be presented to the Business Mail Entry Unit at the Post Office issuing the permit number.