On further thought….

That’s just stupid.
I’m creating problems for myself where, as of yet, no problems exist.
I’ll buy the Endicia labels. OK, so there won’t be delivery confirmation; if someone is really insistent about it, I can go out & get it. I need to make products & actually sell them before I can worry about annoying customers I don’t even have yet.
So! That’s that problem sort of solved.
On to bigger and more interesting things.