Of course, there were 5.25 inch floppies that had tiny storage capacity. But I was referring to not using any physical media - using the computer itself to transmit the proggies.
Personally, I sent my first e-mail message in 1980...thought it was internal to my company, it still went to the UK division. In 1987, I bought my house from an internal employee on the in-house bulletin board system at DEC (Digital Equp't Corp). I had been using the company internal BBS back then since 1986.
In 1994, I was thrilled to trade in my modem and go to 14.4 k from 9600 baud. I thought I died and went to heaven. Liekwise further back in 1973,
I recall feeding punched tape into the leased-computer system to feed my research project results. That was maybe at 110 baud..not sure.
Hell, I'm waiting for someone to say how they JUST gave away their last carrier pigeons.