A bounce rate of two percent can be excellent or catastrophic depending on what is in the denominator. Most dashboards divide bounces by sends, which hides the failure mode that actually matters: a list full of addresses that were already dead before you sent.
Split the number three ways
Bounces over new addresses measures list quality. Bounces over addresses that received successfully last month measures reputation and infrastructure. Bounces over addresses you have never sent to measures your acquisition source. One blended percentage mixes three different problems and points at none of them.
The denominator that receivers use
Providers watch complaint rate per delivered message, not per send. A campaign with a high bounce rate and no complaints is a list hygiene issue; a campaign with a low bounce rate and a rising complaint rate is a content or consent issue, and it is the one that gets you blocked. Track both, separately.
Why the first send to a domain is special
New domains receive your mail without any history, so a single bad first impression can put you in a spam folder for months. Measure the first-send cohort separately and send your best content to it — the recipients who open and click are the ones building your reputation.
The detail that makes it actionable
Store the reason from the remote server with every bounce. 'User unknown' and 'mailbox full' both count as a bounce and mean completely different things: one is a dead address, the other is a customer who will read your mail next week.
Volanea keeps the remote diagnostic next to every bounce and reports bounce rate per cohort, not as a single blended number.
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