Lol, OK. Yeah. Didn’t think about caveats. :D

Ah, fair enough. So that’s similar to “infinite universes of infinite possibilities, except light can never go faster than 300.000 km/sec”?

In an infinite list of letters, every single book ever written, every word ever spoken (and to be written/spoken) should be present no?

I guess the only caveat is that in an infinite universe certain physical laws could be universal (which would prevent eg any universe to break the speed of light)? But some version of me having hair past my 30s should certainly exist no?

Or am I getting this completely wrong?

Depending on your local postal laws and how willing your postman is, it would either get delivered, and the delivery address gets asked to pay, or it would not get delivered. Or it would get delivered, with just a little complaint note attached.

I’d argue the risk of non delivery is probably relatively high in most countries.

Place where I live has super good postal delivery. My workplace gets quite a lot of post. They deliver it with a little note to inform you postal fees should be paid.