Diagnose it free
Your bounce rate spiked. Here's how to find out why — free.
Upload your list and find out what percentage is bad, plus roughly how many contacts and a sample you can check yourself — before your next campaign.
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What counts as "high"?
| Bounce rate | What it means |
|---|---|
| Under 2% | Healthy — normal decay |
| 2–5% | Warning zone — your list needs attention |
| Over 5% | Urgent — reputation damage is compounding with every send |
- List decay
- Addresses die as people change jobs and abandon inboxes.
- Bot form fills
- Fake signups — including bots using real people's valid addresses, which standard checks miss.
- Unverified imports
- Old CSVs and migrated lists carrying years of dead weight.
Mailbox providers read high bounce rates as a spam signal. Reputation drops → more emails land in spam → opens and revenue fall — even for your good subscribers. Meanwhile you keep paying your ESP for every dead contact.
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Zoned and tagged in your platform
High bounce rate detected
Your recent send bounced in the urgent zone — over 5%.
Problematic contacts we found
“We got a bounce warning the week before our biggest send of the year. The free analysis showed us how much of our list was bad and gave us a sample we could check ourselves — that was enough to trust it. We paid for the deep clean, and the campaign shipped on schedule. No panic, no guesswork.”
Head of Lifecycle Marketing, a DTC skincare brand
From the team behind SpamKill (opens in a new tab)
Stop guessing. See the report.
🔒 Encrypted · Data deleted after analysis · No credit card.