Hello,
Well unlike moat of the freelancers here I will take the time to write a proposal onstead of copy paste one that is ready.
I see that you need to get the emails of freelancers registered in freelancing websites. Honestly, I don't think that is possible or at least not the easiest thing. These platforms want employers to do business *on* them, if they provide you their emails you could have direct contact with them, which would cause losses for the platforms. I believe we could, however, investigate more about this, and see what solutions do we have. I have been working on freelancer for a while now and have never noticed anywhere where someone's email was.
I also have other suggestions about who to reach out to, instead of just going bulk, it might be better to only target people with good reviews or good profiles.
Overall, I will be looking forward for your reply for further discussion, I will be more than glad to take a challenging project like this one.
Thank you,