If I've deleted the email is there any way to know, later in the same season, who declared for the draft?

I don't know of any way to get that. I'm not at a point in any of associations to check, but it would be nice (and seemingly appropriate since it's "newsworthy") if it was posted in the NEWS section, but I'm pretty sure it isn't. (I just put that into the CB2023 Suggestions List.)

Not in the News section. I checked. Yes, it is a good suggestion for 2023. Thanks.