Email was broken
So we (mostly) fixed the email problem that we didn't know we had until recently (though we suspected but were a bit too busy to try...).
I've confirmed new users are getting emails. However, that leaves us with a month of signups that got no activation email.
I tried to send out an email to people that signed up after May 1 with the activation link, but I'm not sure it actually went out. If you got an email today, please tell me! Otherwise, I'll send it out tomorrow to make sure people got it (I really don't want to spam, though). The mail server can be of varying speed, which is the reason for the confusion.
One remaining problem is we don't have mailboxes for @tech-artists.org domain, so emails to firstname.lastname@example.org and similar are bouncing back. We'll fix this soon but you should be able to Private Message me if you need help.
Thanks for bearing with us while we get all this stuff sorted out, it isn't fun to do and I'm sure it's even worse to endure!