Mail is more and more going electronically. I haven’t put a stamp on a bill paying envelope in years.
There is only one bill I cannot pay online - my water bill. It gets paid to a podunk little town one mile from my house on my way to work. And it’s right across the street from my post office!
The heck with it; costs me less to drive it there than it does to mail it.
I mail about 10 Christmas cards a year. The rest of my correspondence goes by email or fax.