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Email verification is a boring category with a huge revenue impact. A 3% bounce difference on a 100K send is the difference between a healthy sender reputation and Gmail's spam folder. Here's what to look for.
Waterfall vs single-provider
Single-provider verification tops out at ~88% accuracy on cold data. Waterfall verification — routing each email through 3+ providers and taking the confident consensus — pushes accuracy above 96%.
The catch-all problem
Catch-all domains accept every email at the SMTP layer, so most verifiers mark them as 'unknown'. Prospct's MX-aware detection segments catch-alls by likely deliverability, cutting bounces roughly 3×.
Re-verification cadence
Any verified email older than 30 days should be re-verified before send. Prospct's continuous re-verification runs this automatically on stored contacts.