How to use Bulk Email Checker
- Enter an email address or domain into Bulk Email Checker.
- Trigger Bulk Email Checker and it sends the DNS lookups from your browser, not from this site.
- Review the result, which Bulk Email Checker fetches live from a public DNS resolver.
About this tool
There is no server of ours behind Bulk Email Checker. Bulk Email Checker 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 Checker 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 Checker do?
Bulk Email Checker validates the address format and checks the domain's MX, SPF and DMARC records via DNS from your browser.
Do I need an account for Bulk Email Checker?
No — Bulk Email Checker needs no account, sign-up or installation.
Where does Bulk Email Checker run its checks?
Bulk Email Checker 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 Checker confirm a mailbox really exists?
Bulk Email Checker 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.