I did research in this area with the amazing Jeff Huang [1]. (Here's the findings: https://medium.com/@karan/how-do-spammers-harvest-your-e-mail-address-3d30c7

I did research in this area with the amazing Jeff Huang [1]. (Here's the findings: https://medium.com/@karan/how-do-spammers-harvest-your-e-mail-address-3d30c77a019a https://medium.com/@karan/how-do-spammers-harvest-your-e-mai...) Answer to your question: https://d262ilb51hltx0.cloudfront.net/max/2000/0*q9f3570SPFftR9cx.png https://d262ilb51hltx0.cloudfront.net/max/2000/0*q9f3570SPFf... > Notably, spammy mailing lists send the most spam. These mailing lists include sites that promise you free credit scores, or insurance quotes, or free ipads etc. These sites stink of spam, but people still continue to give them their email addresses. [1] http://jeffhuang.com/ http://jeffhuang.com/