[floatingatoll]

Not as readable, but each inter-character spot is a bit, and if you have 11 bits, you can represent 2^11 addresses.

EDIT: Assumes Zero or One periods per bit-gap; if you can chain them, the sky’s the limit.

[ixwt]

I just tested it with a bunch of periods. I got rejected with just two periods adjacent, and with quite a few more periods adjacent. So only bits. Looks like it can be used for filtering too.

[dimensi0nal]

Dots cannot appear consecutively in the local-part unless quoted.