I need a python email checker script for netflix

Hello,
I have company related to films, and I need to do an email marketing ads.
I have for this a client base of 1 millions emails, And i want to know which email have netflix or no!

Your script must :
- Check if email is registered or no in netflix.com (registred in valid.txt and not registred in notvalid.txt)
To do this I have a small idea :
Put the email and a fake password in login page
If the error is : "Incorrect password. Please try again or you can reset your password." It's mean that it's valid
If the error is : "Sorry, we can't find an account with this email address. Please try again or create a new account." it's mean that it's not valid

The problem with this solution is that you can get banned very fastly

- Script must be fast if possible to check 1 million in 7 days it's will be very nice
- Must have a solution to avoid the banning of netflix (Maybe use proxy)
- Must check 1M without any drops or any problem. and if possible must have an option to resume checking if there is any problem