Cost Per Thousand Product Response Rate Wikipedia 
Hubspot
NOVEMBER 6, 2018
But, if you see a Nike billboard, scroll past a Nike sponsored Instagram post, and receive a Nike email all promoting the same product … you’ve definitely witnessed a marketing campaign. Promote a new product or service. You might answer this with “email open rates,” “new Facebook Page likes,” “product pre-orders,” or all of the above.
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. CPM (Cost per thousand) - In email marketing, CPM commonly refers to the cost per 1000 names on a given rental list.
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