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The Ultimate Guide to Marketing Campaigns

Hubspot

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. Click-through rate. Opt-in rate. Cost per opt-in. Follow-up email open rate. Opt-in conversion rate.

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Glossary: 29 Email Marketing Terms Marketers Must Know

Hubspot

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.