Envelopes have always driven printing. Because printers don’t usually produce envelopes ourselves, we’ve always been constrained by their dimensions, availability, and price.
If you know anything thing about printing in the last 5 years, it’s probably this: the two main ways to get an image on paper are with either a digital or an offset press.
Many companies cover their printing needs in-house because they fear hiring a printer will be too expensive....Truth is, it's more affordable now to order digital prints than it was years ago.