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some users told me that the system cleans up itself the addresses which don't open my emails for 3 months, INCLUDING the most recent ones. Where can I get the support on customising it?

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Hi @Evgeniia the system doesn't automatically clean itself. It does however automatically add the subscriber to the Cold Subscriber list (Convertkit define cold subscribers as any subscriber who hasn’t opened or clicked an email in the last 90 days. For subscribers who have been active for fewer than 90 days, we define cold subscribers as anyone who hasn't opened or clicked an email in 30 days.).

Please check this link on How to Prune Cold Subscribers from your List.

I hope it helps. If you're still having issues you can always reach out to