I know this because I am the person that sets up and runs these campaigns and gets paid peanuts. That is why every week I "borrow" a few of their leads and make a few bucks extra on the side. It is also why I do not mention any names of companies or anything on this blog that can lead back to me. In fact I this is not even my blog! It is not Illegal or Unethical, just good business.
Also I havent stolen this information anywhere. It is not "Classified or Top Secret" information. It is simply hidden from the regular guy in the street - A so called "TRADE SECRET"!
Obviously they buy from reputable sources and not some guy that is selling a million leads for ten bucks, and I have listed a few great sources for you below but for now you can try some free lists.
YOU CAN TAKE MY WORD FOR THIS...IT IS MY DAY JOB AFTER ALL :)
One of the reasons I use this particular platform is that it has built in verification. usually you need software to verify email addresses on a list before sending them (to reduce bounce rate). DM does this on the fly. Before it sends a mail it verifies it beforehand and automatically does not send to the address.
I also recommend this particular Mailer because it is easy to use, If you can send an email with Gmail or Outlook, YOU CAN USE THIS!
Just two things about Dangerous Mailer. The first is, Make sure you get the Credits Based Plan. Do not take the hosted version this requires you to have your own server. The second thing is that it takes about 24 - 48 hours before they send your log in to you so if you order and nothing happens don't panic!
Anyway that is exactly how Retail Giants reach your Inbox with offers everyday even though you have never bought something there. Check out the pics below to see what the mailer looks like. Like I said it is easy to use so you do not require any technical skills!