Your ESP says you sent to 47,000 “delivered” addresses. But not all 47,000 are real people who can open your email:
29% of your denominator can’t engage. Catch-all addresses (domains that accept all email, even fake) and role-based addresses (shared inboxes like info@) are counted as “delivered” but produce near-zero opens. Every one is a zero dragging down your rate.
These numbers are illustrative — your specific gap depends on your list composition. But the pattern is consistent across lists we’ve verified. See the full math →
Catch-all and role addresses inflate your denominator with zeros. Your content may be performing at 31% on real people — but your dashboard says 22%.
Full open rate breakdown →ActiveCampaign, Mailchimp, HubSpot charge by contact count. 27% of your list can’t engage but costs the same as your best customer.
See the cost math →Lists go stale at 2-3% per month. If you haven’t cleaned in 6 months, up to 15% of addresses may now be invalid — bouncing and damaging your reputation.
How stale lists trigger spam traps →When 29% of your denominator can’t engage, small differences between subject lines get drowned in noise. You’re testing on dirty data.
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