The Difference Between Syntax, Domain, and SMTP Validation Explained Simply
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Frequently Asked Questions
Find answers to common questions about email verification.
What is syntax validation?
Syntax validation checks if an email address is written in the correct format, including the @ symbol, proper structure, and no invalid characters.
What does domain validation do?
Domain validation verifies that the domain part of the email address (like gmail.com) exists and is able to receive emails.
What is SMTP validation?
SMTP validation connects to the recipient’s mail server to check if the email address actually exists—without sending an email.
Is syntax validation alone enough?
No. An email can have correct syntax but still be inactive or fake. Domain and SMTP validation are needed for accurate results.
Why are all three validations important together?
Using syntax, domain, and SMTP validation together helps reduce invalid emails, lower bounce rates, and protect your sender reputation.
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