Email verification checks syntax, whether the domain exists and can receive mail, and often whether the specific mailbox appears to be active. Results are usually grouped as valid, invalid, risky or unknown.
Why it matters
Verifying before sending reduces bounces, protects sender reputation and avoids wasted effort on addresses that will never receive your message.
Common pitfalls and tips
Verification is not permanent. Addresses go stale as people change jobs, so re-check older lists before reuse and always verify new imports before they enter a campaign.
Example
Before launching a campaign, a team runs its list through verification. It removes invalid addresses, sets aside risky ones and sends to the valid group first.
How Leadvaro relates: Records from Email Finder are re-verified around the clock, and you should still check your own sends.