auto mass mailer

Hi all, After scraping many business emails it's time for email marketing! I'm advertising digital services - B2B to a cold list. Volume of 500-1000 daily at the beginning and I want to get replies by Email Telegram or Skype. What is the most recommended software for my needs?

So, I made a bot that scraped info from craigslist' site and put it up as an educational piece. Gave away the source code and everything at no charge. Two months later my boss at work started receiving calls from the CL investigation team, he ignored them. Then corporate bosses started getting...