Below we dig a little bit deeper into the ins and outs of everything that this mail option has to offer. Of course, not all mail handled by the post office is designated as First-Class – and not all First-Class mail is equal across the board.
The USPS offers a wide range of services for Americans to take advantage of to send mail, but nothing is more popular than First-Class mail. Universally regarded as the most cost-effective, speedy solution for mailing letters, bills, larger envelopes, postcards, and even flatpack parcels, the odds are pretty good that the overwhelming majority of the mail that you have dropped into a mailbox has been sent via First-Class.