Its not the best site i have used, but it seems to work for me, had no trouble with my email address.
scroll to the bottom of the page and click "(or login to continue a previous session)" - button or follow this link to resume your point collecting.
https://innercore.network/bounty/resume.html

if your email is not working on this site, how 'bout you go to gmail.com and make a new email, an email you can use on airdrops/token sites and bullshit sites.

let me know if there is anything i can help with :)