The U.S. Postal Service has recently changed first-class and Priority Mail service times. First-class Package Service and Priority Mail were previously 2 to 3 day service commitments. Both are now 3 to 4 days. Please allow sufficient time for mail processing. To ensure that you receive the postmark by any of the due dates, we suggest that you take your mail into the post office and have your envelope hand-stamped by the post office.