CPM Cross-Selling Direct Marketing Response Rate 
Biznology
JANUARY 5, 2015
Unfortunately these systems are nothing more than repositories of registration data, and do not provide the capability to perform analytics on the campaign results of cross channel and multiple communications. Many marketers choose to judge and select their marketing communication tactic based on cost per impression or CPM.
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. In its broadest sense, every e-mail sent to a potential or current customer could be considered email marketing.". 25 per email address.
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