Then I would really suggest to send an email to everyone who ever made a forum account here!
These are possible people who are interested (or were in the past).
I am sure there are a lot of people not that active anymore.
They've already done that.
Yeah i just read about that on the kickstarter, but I still havent gotten any email strange.
(there was also nothing in the spam folder).
So maybe just double check, if all got one. (I got a message from the forum about a PM before, so the email should work).
I am relatively new to the forum, so maybe that was a problem?
Or did you only sent emails to the people on the mailing list?
Since I am only part of the forum not the mailing list. (If so please also send to the forum members alone (and just say "sorry if you get this twice" or something I mean it is understandable if you send it to the email list and the forum. And just explain that it may be received double if being part of both).
You can also change the text a little bit to show some effort to people getting both.