I think the combinatorial space [1] of email addresses is (2^72)2^264 (64 octets @ 256 octets) 2^336 is a non-trivial number of lines in a lookup table. T

I think the combinatorial space [1] of email addresses is (2^72)2^264 (64 octets @ 256 octets) 2^336 is a non-trivial number of lines in a lookup table. That’s why hierarchical schemes probably make sense. Good luck [1] valid address space is of course smaller.