See exactly how many bounces your next campaign will produce - and what it costs your sender reputation.
BounceZero removes invalid, catch-all, role-based, and disposable addresses before they reach your sender domain. Average verification cost: $3/1,000 emails. Average processing time: 8 minutes per 10K emails.
The email address was never created, was deleted, or the domain no longer exists. Every hard bounce permanently damages your sender reputation. Hard bounces should be 0% of your sends - any hard bounce means an unverified list.
The address exists but the inbox is full or the server was temporarily down. Soft bounces are usually retried automatically. High soft bounce rates suggest role-based addresses (info@, admin@) or abandoned inboxes.
B2B email addresses become invalid at 22% per year. People change jobs, companies shut down, domains expire. A list that was clean 6 months ago has gained roughly 11% new invalids. This is the hidden cause of unexplained bounce rate increases on "clean" lists.
Catch-all mail servers accept every RCPT TO without checking if the mailbox exists. Standard SMTP verification cannot detect these - they appear valid until the bounce arrives. BounceZero uses 3-probe fingerprinting to identify and flag catch-all domains.
| List source | Typical bounce rate | Without verification |
|---|---|---|
| Apollo / ZoomInfo / Lusha export | 15-30% | High risk - suspend your ESP account |
| LinkedIn connections + manual | 8-15% | Medium risk - ISP filters likely |
| Your own CRM (12+ months old) | 12-22% | High risk - data decays fast |
| Your own CRM (fresh, 1-3 months) | 3-8% | Low-medium - still worth verifying |
| Purchased email list | 25-50% | Critical - will get you blacklisted |
| Newsletter opt-in subscribers | 1-4% | Low - but re-verify if older than 90 days |
| After BounceZero verification | < 1% | ✓ Safe - domain reputation protected |
Deep-dive guides on how email verification and inbox placement work
272,446-domain census: DMARC gap, provider divide, catch-all rates
10.2M verifications: 12.3% of addresses are dead, and where they hide
826K re-verifications: only 19% of valid addresses survive 90 days
True catch-all is 1.4% - most of what looks catch-all is unprobeable providers
info@ bounces 4.5x more than personal addresses - measured, not guessed
The 3x invalid-rate gap that vanishes when you control for domain size
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