Mailer King from Tavel's site google Mailbot (tavel.in|mailerking.net) you can use that as a mailer(Mailer King). If you're in the US or CA you will have to use Tor or a VPN to access this site lution.ee where you can buy hotmail accounts for $0.001 per acc so $1 for 1k accounts.
You use Mailer King and the hotmail accounts using SMTP I can send 50k nowadays with 3k accounts that's 3 bucks.
For proxies use storm proxies they have SMTP ports opened(rotating proxies) Can hit their thread up on here for 15% discount too. I'm not using storm proxies to get out 50k mails though. Not sure how storm will perform with SMTP and hotmail.
Try another proxy company if storm is no good but SMTP ports have to be opened so confirm that.
Look on this thread where I post settings for Mailer King:
https://www.blackhatworld.com/seo/blackhat-email-marketing-advice.1466340/page-8
only this has changed hotmail mailing server: smtp-mail.outlook.com same port 587