Cost Per Thousand Open Rate Opt-in Wikipedia 
Hubspot
NOVEMBER 6, 2018
You might answer this with “email open rates,” “new Facebook Page likes,” “product pre-orders,” or all of the above. Email open rates and click-through rates. Why is that? Well, campaigns make companies memorable. They promote a focused effort that guides consumers towards a desired action. You get the gist.).
Hubspot
DECEMBER 21, 2010
According to Wikipedia , " Email marketing is a form of direct marketing which uses electronic mail as a means of communicating commercial or fund-raising messages to an audience. Marketing Takeaway: If you have a "join our mailing list" form on your website, you should place it "above the fold" making it easy for visitors to opt-in.
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