How to use Bulk Email Validator
- Enter an email address or domain into Bulk Email Validator.
- Run it, and Bulk Email Validator issues the DNS lookups directly from your browser.
- Read the response Bulk Email Validator shows below — it comes from a public DNS resolver, not from this site.
About this tool
Bulk Email Validator runs as a page in your browser. Bulk Email Validator inspects the DNS-level deliverability signals for a domain directly from your browser.
Proving a specific mailbox exists requires sending mail, which a browser cannot do, so Bulk Email Validator focuses on the DNS signals that genuinely can be checked. The MX, SPF and DMARC checks are DNS queries sent from your browser to a public resolver; this site has no backend and never sees them, and a connection is required.
Frequently asked questions
What does Bulk Email Validator do?
Bulk Email Validator validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Is Bulk Email Validator free to use?
Yes — Bulk Email Validator is completely free, with no usage limits.
Where does Bulk Email Validator run its checks?
Bulk Email Validator runs DNS lookups (MX, SPF, DMARC) from your browser against a public DNS-over-HTTPS resolver. This site has no backend and never sees them; the public resolver does.
Can Bulk Email Validator confirm a mailbox really exists?
Bulk Email Validator checks address syntax and the domain's MX, SPF and DMARC via DNS-over-HTTPS; proving a live mailbox needs to send mail, which a browser cannot do.