Email Validator
Verify syntax, check domain configuration, and test deliverability for any email address.
Email Syntax & SMTP Delivery Checks
Maintaining a clean email list is the foundation of high sender deliverability. If you broadcast newsletters or marketing updates to obsolete, invalid, or misspelled email addresses, your bounce rate will surge, causing email providers to junk your subsequent campaigns.
Our Email Validator queries recipient domains in real-time. It runs regex checks to confirm syntax compliance, queries DNS for active MX records, and initiates temporary SMTP handshakes to verify if the recipient mailbox actually exists on the target server without sending an email.
Frequently Asked Questions
What is a catch-all email domain?
A catch-all (or accept-all) domain is configured to accept emails sent to *any* username, redirecting them to a single inbox. SMTP verification cannot confirm if a specific user exists on these domains.
Does email validation send an email to the recipient?
No. The validator initiates a standard SMTP connection, queries the mailbox availability, and gracefully terminates the session before any message data is transmitted.
Why is a syntax check alone not enough?
A syntax check only verifies that the email address is formatted correctly (e.g., has an @ sign). It cannot confirm if the domain exists or if the mailbox is active.
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