[ Free tool · DNS & Mail Servers ]
MX Lookup
See a domain's mail servers and whether the setup is valid DNS.
[ About this tool ]
This MX lookup lists the mail servers for a domain in priority order and resolves their addresses.
How to read the results
- ›Lower preference numbers are tried first.
- ›MX must point to a hostname, never an IP or CNAME.
- ›A null MX (0 .) means the domain accepts no mail.
Frequently asked questions
What is an MX record?
A DNS record that tells other servers where to deliver email for your domain.
Learn more in our guide: Email Deliverability: How to Reach the Inbox, Not Spam
Enterprise provenance
Why top financial institutions and governments retired their email security dashboards.
Traditional email authentication platforms sell you a dashboard and ask your engineers to do the labour. In high-stakes environments, manual oversight means delayed enforcement, configuration drift and unmonitored shadow domains.
EmailAuth is the agentic email provenance platform. Our agents enforce p=reject, keep third-party senders aligned and move your domains to full RFC 9989 compliance, the new DMARC standard,, with human-in-the-loop auditability.
SaaS · Dedicated tenancy · Air-gapped on-prem · BYOK encryption
[ More tools ]
Google & Yahoo Sender Check
Pass/fail against the Gmail and Yahoo bulk-sender rules.
Blacklist & DNSSEC Checker
Check your mail server IPs on spam blocklists and see DNSSEC status.
Reverse DNS (PTR) Checker
Check PTR records and forward-confirmed reverse DNS for sending IPs.
Domain Age & RDAP Lookup
See when a domain was registered, when it expires and if it's locked.
Email Header Analyzer
Paste a message header and see why it passed or failed DMARC.
Full Domain Health Scan
Run every email security check at once and get one score.