Email Bounce Rate Calculator
A hard bounce rate above 0.5% puts your sending domain at risk of ISP throttling. Enter your bounce numbers to see exactly where you stand against Gmail and Yahoo's thresholds.
Understanding Bounce Rates
What is a hard bounce?
A hard bounce is a permanent delivery failure — the email address is invalid, the domain doesn't exist, or the mailbox is permanently closed. Hard bounces damage your sender reputation immediately.
What bounce rate triggers ISP blocks?
Gmail enforces a hard bounce rate threshold of approximately 2% and will throttle your delivery. Yahoo and AOL use stricter thresholds. Hard bounces above 0.5% signal list quality problems to ISPs.
Why does soft bounce rate matter?
Soft bounces (mailbox full, temporary unavailability) don't immediately damage reputation, but persistent soft bounces often indicate a full inbox or a temporary block — which can become permanent if patterns repeat.
How do I reduce my bounce rate?
Use email list verification tools before sending, implement double opt-in for new subscribers, remove invalid addresses, and regularly suppress non-openers and bounced addresses from future sends.
Related tools:
High Bounce Rates Are a Symptom. InboxEagle Finds the Cause.
Bounces from invalid addresses are one thing. Soft bounces from Gmail and Yahoo often signal blacklisting or reputation damage — which you won't see in your ESP dashboard. InboxEagle monitors inbox placement, blacklist status, and authentication across all major ISPs.
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