How to personalize based on engagement history?
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Here's the thing: your most engaged subscribers deserve different treatment than those going silent. Engagement-based personalization starts with dividing your list into activity tiers. Active openers and clickers get one experience. People who opened 30-60 days ago but haven't in a while get a different message. And those dormant for 90+ days need something with real teeth to win them back.
For your active subscribers, this might mean VIP early access to new products, loyalty rewards, or recommendations based on what they've already bought. For people slipping away, send something that gives them a reason to care again. For the truly cold list, you need a real incentive and an honest "we miss you" message. The key is matching your tone and offer to where they actually are in the relationship. (It's not where you wish they were.)
Getting technical about it: most ESPs let you calculate recency, frequency, and monetary (RFM) scores. This tells you which segments matter most and deserve the most attention. Your best customers should feel recognized. Your at-risk ones need help before they leave for good. Your engagement data is basically telling you how people actually feel about your brand. so send messages that meet them where they really are, not based on guesses.
Related: personalization, dynamic content, spam filters.
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