What is frequency segmentation?
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Frequency segmentation is the practice of splitting your list into groups that get mail at different cadences. Not because of content interest, but because of how often each group wants (or can absorb) email from you. It's a targeting choice, not a strategy philosophy.
The three common ways to build it.
- Self-declared. Your preference center lets subscribers pick daily, weekly, monthly, or major-moments-only. Reliable because it's their choice. Under-used because you have to actually ask.
- Engagement tiers. Highly engaged subscribers get more (they want it). Lightly engaged get less (they don't). Dormant get almost none (or a re-engagement track). The rules are automated from open and click data.
- Lifecycle-based. New subscribers get a dense welcome cadence. Mid-lifecycle get your normal send rhythm. At-risk or churned get a lower, more deliberate drumbeat.
Most programs end up combining all three. A new subscriber who explicitly asked for "weekly" still gets a tighter welcome window, then drops to their stated frequency.
Why it's a separate concept from frequency strategy. Strategy answers "how often should we send?" across the whole program. Segmentation answers "what cadence should each group get?" within that. One is a brand-level decision. The other is a list-operations decision. You need both, and conflating them is how teams end up blasting daily to segments that would've stayed engaged at weekly.
What it protects. Frequency mismatches are one of the top drivers of unsubscribes and complaints. Good frequency segmentation keeps your unsubscribe rate down and your engagement metrics up, which feeds your sender reputation.
How to start. Split your active list into three engagement tiers. Mail the top tier at your normal cadence. Cut the middle tier to every other week. Cut the bottom tier to monthly. Measure open rate, complaint rate, and unsubscribes for six weeks. The middle tier almost always surprises teams, its engagement often goes up when you send less.
Before you build cadence logic on top of the list, make sure the list is real. Engagement-tier rules run on open and click history, both of which are messy when invalid addresses and bots sit inside your active segment. Validate with Review My Emails first so your tiers reflect actual humans.
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