Bounce Rate
Bounce rate is the percentage of sent emails that are returned as undeliverable, and a high rate signals poor list quality that damages sender reputation.
Bounce rate is the percentage of emails you send that are returned as undeliverable instead of being accepted by the recipient mail server. Bounces come in two kinds: a hard bounce is a permanent failure (the address does not exist), while a soft bounce is a temporary one (a full mailbox or a server that is briefly unavailable).
Why it matters for outbound
Bounce rate is one of the clearest signals a mailbox provider uses to judge list quality. A high rate tells the provider you are sending to addresses you have not verified, which is a hallmark of spam, and it directly damages sender reputation and domain reputation. In cold outbound, where lists are built rather than opted in, controlling bounces is essential. Repeatedly hitting bad addresses can also trigger a spam trap, which is even more damaging.
Outword validates and cleans data before sending so bounce rate stays low and deliverability stays protected.
How it works
- A receiving server rejects the message and returns a bounce notification with a reason code.
- Hard bounces should be suppressed immediately and never retried.
- Soft bounces may be retried, but persistent ones should also be removed.
The defense is rigorous list hygiene and email validation before a campaign launches. Our data and list building service keeps bounce rates well inside safe thresholds.
From definitions to pipeline
Outword turns outbound theory into a running motion. Book a call to see what that looks like for your team.