Email Bounce Rate Calculator
Calculate your bounce rate and see whether your list hygiene is putting your sender reputation at risk.
Why bounce rate matters
Bounce rate is bounced emails divided by emails sent. A high bounce rate signals poor list hygiene, and mailbox providers treat it as a strong spam signal - it's one of the fastest ways to damage a sending domain.
Keep bounce rate low (ideally under 2 to 3 percent) by verifying addresses before you send and removing hard bounces immediately. Use the email verifier to catch undeliverable addresses before they cost you.
Hard bounces vs soft bounces
A hard bounce is a permanent failure: the address doesn't exist or the domain can't receive mail. These are the dangerous ones - each is a signal to the receiver that you're mailing a list you haven't cleaned, and they should be removed immediately and never retried.
A soft bounce is temporary: a full mailbox, a message too large, or a server briefly down. Those often clear on their own, but an address that soft-bounces repeatedly should be treated like a hard bounce and dropped. It's the hard-bounce rate that most damages reputation.
Where you stand
Bounce rate bands for cold outreach. The lower the better - clean lists barely bounce at all.
| Bounce rate | Status |
|---|---|
| Under 2% | Healthy list hygiene |
| 2 to 5% | Warning - verify and prune your list |
| Over 5% | Serious - pause and clean before sending more |
Frequently asked questions
How is bounce rate calculated?
Bounce rate = (bounced emails / emails sent) x 100. Hard bounces (permanent failures) matter most for reputation.
What bounce rate is too high?
Aim to stay under 2 to 3 percent. Higher rates signal poor list hygiene and quickly damage your sender reputation; above 5 percent you should pause and clean the list.
What is the difference between a hard and soft bounce?
A hard bounce is a permanent failure (the address doesn't exist) and must be removed at once. A soft bounce is temporary (full mailbox, server down) and may clear, but repeated soft bounces should also be dropped.
How do I reduce bounces?
Verify addresses before sending, remove hard bounces immediately, and never mail purchased or scraped lists. Running your list through an email verifier first catches most undeliverable addresses.
Next steps
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