What’s the balance between retention and hygiene?
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The tension is real. Retention says: keep as many subscribers as possible. Hygiene says: remove the ones who aren't engaged. Both camps have a point, and the answer isn't to pick one over the other.
What retention actually means
Good retention isn't about keeping addresses on a list. It's about keeping people who want to hear from you. The tactics that actually work: consistent value, predictable cadence, relevant content, easy preferences management. If you're doing those things, your engaged readers stay engaged.
Retention also means trying before you suppress. A subscriber who's gone quiet might reactivate with the right message. Run a re-engagement sequence before you write anyone off. Give them at least one chance to opt back in actively.
What hygiene actually means
Hygiene isn't punishing subscribers for not opening. It's protecting your sending reputation so that the people who do want your emails actually receive them. Inbox providers score your mail partly based on how often it gets ignored. A list loaded with disengaged addresses makes everyone's delivery worse, including your most loyal readers'.
Hygiene also means removing addresses that are structurally broken: bounced, expired domains, known risky addresses. Those ones aren't a retention question. They should go immediately.
Where the balance lives
Try to retain first. Suppress when the signal is clear. The sequence looks like this:
Subscriber goes quiet. You segment them into an inactive tier. You send a re-engagement sequence. If they respond, great. If they don't, suppress. No ambiguity. No "give it one more month."
What you should avoid: mailing your full list at full frequency, hoping the inactive people eventually wake up. They won't. And the ones who would respond to a targeted re-engagement email are getting buried in sends they're ignoring.
Run validation hygiene to catch the structurally broken addresses, then run engagement hygiene to manage the humanly disengaged. Both protect the subscribers you actually want to keep.
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