Cold email bounce rate — the number that protects your domain

Bounce rate gets ignored until it quietly wrecks a sending domain. Mailbox providers read a high bounce rate as "this sender doesn't know who they're emailing" — and downgrade everything you send next.

How we measure it

Bounced leads ÷ contacted leads across 1OAKS campaigns. A bounce here is a hard failure attributed to the recipient address.

Where you want to be

Under ~2% is healthy. Past ~5% you're actively damaging domain reputation; past ~10% some providers will start refusing your mail entirely. The fix is never "send anyway" — it's list hygiene before the campaign starts.

What drives bounces

• Stale lists. B2B email decays fast — people change jobs constantly. A list older than a few months needs re-verification.
• Scraped or guessed addresses. Pattern-guessed emails (first.last@domain) bounce heavily.
• No verification step. Running a list through a verification pass before import removes most of the risk.

1OAKS auto-suppresses a hard-bounced address so it can't be re-sent, and a "do not contact" reply permanently blocks that contact for your account — both protect the bounce rate going forward.

The takeaway

Bounce rate is a leading indicator of domain health. Keep it low by verifying lists *before* the send, not by reacting after placement has already dropped.