1. run OpenSiteExplorer on top 3 competitor domains: https://moz.com/researchtools/ose/
2. pick high profile links (high PA and DA scores, and spam scores below 3) and put them at the top of the list. then go through the rest of the list (of the ones with no PA and DA scores) and remove the ones that look spammy
3. choose 20 of the best ones and find their email addresses (find the people who run it, find their emails, and/or look for their guest posting submission policy as an email should be listed on there)
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