FYI: The best way to guest post on other sites isn’t through blind introductions. You’re better off following those sites, commenting on their articles, interacting with them on Twitter and growing a relationship. Then, send them a personalized proposition for a guest post. Respectfully, this isn’t the way to do it.
Remember that these sites get a TON of requests for guest posts, as do I. I ignore 99.9% of them because I get blind propositions from those I don’t know. Oh, and I can guarantee you that you won’t guest post on Mr. Money Mustache, so you can probably cross that one off your list.