For anyone trying to signup for the newsletter from the maintenance page it WONT work, if you get hit with a captcha its from cloudflare not the newsletter. I added 5 diff emails and got nothing then i went to the live site .us and went to INfo>Mailing list and it worked sending me confirmation.
This is where you go when signing up from the maintenance page which leads to a 404 page not found:
https://www.mephistogenetics.ca/newsletter/subscriber/new/
Seems the signup on the maintenance page simply does not work at all, so to get into the list you need to access a live site.
You can also try this direct link that worked for me while the maintenance page is up:
Subscribe to the Mephisto Genetics Newsletter & hear about all the news, promo's, discounts & spacial offers first!
www.mephistogenetics.ca