Every email is checked before delivery: syntax and typos, whether the domain has a working mail server, whether the mailbox exists, and whether it's a catch-all, disposable or role address.
- Valid: the mailbox exists. Safe to send.
- Risky: the domain accepts all mail (catch-all), so we can't confirm the mailbox. Often fine, but send to these after your valid contacts.
- Invalid: the address won't receive mail. Crwl drops these, and you're never charged for them.
Tip: Keep bounce rates under 2% by sending to valid emails first. Your sending domain will thank you.
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Still have a question? Email support@crwl.ai.