Why verify an email address before cold email?
Because a bounce costs more than the email. Mail providers watch how often a sending domain hits addresses that do not exist, and a hard bounce rate above a few percent is one of the fastest ways into the spam folder. A list bought, scraped or a year old always has dead addresses in it. Our guide to email verification covers how to clean a whole list, and bounce rate explains the thresholds.
How does an email verifier check an address for cold email?
It checks the address is written correctly, that the domain has mail servers, and then asks the mail server whether that mailbox exists, without sending anything. It also checks whether the domain accepts every address (catch-all), whether the address is a shared inbox such as info@, and whether it comes from a throwaway inbox service.
What does catch-all mean in an email verifier?
The domain accepts mail for any address, so asking the server proves nothing: dana@ and made-up-name@ both look real. No verifier can confirm a catch-all address with certainty. Treat them as risky and send to them only in small numbers from a warmed mailbox. Our guide to catch-all email addresses walks through the decision.
Can I verify a whole cold email list here?
This tool checks one address at a time, for spot checks and for finding the right address among a few guesses from the email permutator. For a full list, use a bulk verifier before every campaign, or let Pipefire do it: every prospect it finds is verified before anything sends.