Question 1

How does email verification work?

Accepted Answer

Email verification checks multiple factors: domain existence, MX record validity, SMTP server response, and mailbox existence. We connect to the mail server to verify the address exists without actually sending an email, giving you accurate results in seconds.

Question 2

What is a catch-all email address?

Accepted Answer

A catch-all (or accept-all) domain is configured to accept emails sent to any address at that domain, even nonexistent ones. This makes it impossible to verify individual addresses with 100% certainty, as the server accepts everything.

Question 3

Why should I verify emails before sending?

Accepted Answer

Sending to invalid or nonexistent email addresses increases your bounce rate, which damages your sender reputation and can get your domain or IP blacklisted. Verification before sending protects your deliverability and ensures your emails reach real inboxes.