By Anne Holland, Founder
The old rule of thumb in email marketing was "the purpose of email is to get a response, such as an open, and a click." So, most marketers measured their success rate by opens, clicks and, possibly, conversions.
If an opt-in didn't click in a long time period (30 days for a daily, 90 for a weekly, 120 for a monthly), then marketers started to worry. Was the name...
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