if you have any idea how to prevent from receiving this types of emails please lemme know.
Never use your main email address for registering in websites that you don't trust.
They may sell list of email addresses to scammers.
I think your idea is wrong, I think it is not found at the time of registering at website though there is a chance. But I think that email address they found from bounty where they used form. They may fill email address and/or they may use auto response. If the use auto response then they will receive your email address which you are using on that browser.
