USPS 6×9 Envelope (Cost to Ship, Does It Count as a Letter?
Are you curious about using USPS 6×9 envelopes for mailing needs? USPS 6×9 envelopes can be a convenient and cost-effective way to send important documents, cards, and invoices. But what is the cost to ship them and do they count as letters? Over the years, companies have been searching for ways to save on shipping…
