MX lookup

What this lookup shows

• Every MX record, in priority order. Senders try the lowest number first and fall back to the others, so the order matters when more than one exists.
• The provider. The hostname usually gives away the mail service: Google Workspace, Microsoft 365, Zoho, OquMail, a forwarding service, or a hosting company's bundled mail.
• Whether each host resolves. An MX that points at a name with no address is a server nobody can reach, which is a common leftover after switching providers.
• Split setups. Records pointing at two different providers mean some mail can land in a mailbox nobody checks.
• Missing records. With no MX, senders fall back to the domain's A record and try to deliver to the web server, which usually bounces.

How to read the result

Green means a clean setup: one provider, every host resolving. Amber usually means a split between providers or a duplicate record. Red means mail cannot be delivered reliably: no MX records, a host that does not resolve, or an MX that points at an IP address instead of a hostname. The records table lists each server with its priority, provider and the address it resolves to.

Common fixes

• Old provider still listed: delete every MX that is not your current mail service. Our guide to multiple MX records explains why mixing providers loses mail.
• No MX record: add one pointing at your provider's mail host. OquMail users add a single record for mail.oqumail.com with priority 10; the MX records guide shows where that goes at common registrars.
• Records look right but mail is not arriving: work through the not-receiving checklist, which covers caching, typos and the mailbox side.
• Just changed the record: resolvers keep the old answer until its TTL expires, usually within an hour and occasionally longer. See how long DNS changes take.

Questions

Can I see which email provider a company uses?

Usually, yes. MX records are public, and the hostnames name the provider. A domain with mail.oqumail.com uses OquMail; aspmx.l.google.com is Google Workspace; mail.protection.outlook.com is Microsoft 365.

Does the lookup check SPF and DMARC too?

Not on this page. Use the SPF checker and the DMARC checker; the result box links to both with the same domain filled in.

Is anything stored?

No. The lookups run in your browser against public DNS over HTTPS. OquMail never sees the domains you check.