Reply Rate
Reply rate is the share of recipients who send any reply to a campaign or thread, expressed as a percentage of delivered messages. With raw open rates contaminated by Apple MPP and corporate scanners since 2021, reply rate has become the cleanest single engagement signal for cold outbound in 2026.
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Reply rate is one of the few engagement metrics that machines cannot fake. A pixel fires from any pre-fetcher, a click fires from any link scanner, but a reply requires a human, in a mail client, typing words. That makes reply rate the most trustworthy outbound metric in 2026.
How to calculate
Reply rate = unique replying recipients / delivered messages × 100. Most cold-outbound platforms compute this automatically. Filter for genuine replies (exclude out-of-office bounces, auto-responders, unsubscribe confirmations) to get a clean number.
What counts as good
Published cold-outbound benchmarks disagree, mostly because vendors count differently. From their own 2025 data:
- Belkins: 0.45 percent of emails sent got a reply (7.5 million emails).
- Woodpecker: a median reply rate of 1.5 percent across 56,614 campaigns.
- Instantly: an average of 3.43 percent, counting replies to follow-ups.
These are the vendors' own platforms, measured their own way. Your own history, by list and by campaign, is the more useful comparison. Warm and referral outreach replies far more often than cold.
Track real engagement, not Apple MPP noise.
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Frequently asked questions
Should OOO replies count?+
No. Out-of-office and bounce auto-responders inflate the rate without indicating intent. Outsolvi labels out-of-office replies separately so you can tell them apart.
What about negative replies?+
Counting negative replies (\"not interested\") in the rate is correct, but the rate alone is then misleading. Pair reply rate with reply-sentiment breakdown for the actionable view.
Put this concept into practice
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Outsolvi tracks Outlook and Gmail, grades every open as a person or a machine, and flags hot leads, from $7/user/mo billed yearly. 14-day free trial, no credit card.
Start 14-Day Free TrialNate built Outsolvi after watching every email-tracking tool he had ever used lie to him about opens. Outsolvi grades every open as a person or a machine, in Outlook and Gmail, so the number on the dashboard is one a rep can actually act on.
We update these pages when the underlying mechanics change. new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.