Cost Per Thousand CPM Direct Marketing Response Rate 
Biznology
JANUARY 5, 2015
Looking only at cost per impression and not cost per registration. Many marketers choose to judge and select their marketing communication tactic based on cost per impression or CPM. A direct marketing truth – the more relevant the message the higher the response rate. 4.
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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