MX lookup: who receives your domain’s email?
Enter your domain: we list the MX records by priority and tell you which service actually receives the mail, spam filters included.
- Free, no sign-up
- Public DNS records only
- Result in seconds
Want the step-by-step fixes?We email you the full report on SPF, DKIM, DMARC and MX, with the values to copy.
Done: the report reaches your inbox in a few minutes. If you don’t see it, check spam or Promotions too.
What MX records are
MX records tell senders which servers receive mail for your domain. Each has a priority: the lowest number wins, the others are backups.
They matter for senders too: without MX, replies and bounce notices for your emails can get lost, and some filters distrust domains that don’t receive mail.
10 mx1.yourcompany.comThe main server: lowest number, highest priority.20 mx2.yourcompany.comThe backup server, if the first one doesn’t answer.mx.spam-filter.comIf the MX is a spam filter, mail goes through it first.The problems we find most often
No MX
The domain doesn’t say who receives its mail: replies and bounces get lost.
Null MX
A “0 .” record declares the domain receives no mail: remove it if you use mailboxes on that domain.
Old provider
After switching mailbox provider, the old provider’s MX records are still there.
Forgotten filter
An external spam filter in front of the mailbox that nobody remembers having.
Frequently asked questions
What does priority mean?
The number next to each server: senders try the lowest first and move to the others only if it doesn’t answer.
Can I have several MX records?
Yes, it’s normal: usually servers of the same provider, or a spam filter with the real mailbox as backup.
Does changing MX change how I send?
No: MX is about incoming mail. For sending, SPF, DKIM and the server your emails leave from matter.
How soon does a change apply?
It depends on the TTL: usually from a few minutes to a few hours.
More free checks
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OpenDKIM checker
Key on the most common selectors or yours, length and revocation.
OpenDMARC checker
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Open554 5.7.1 error
Why the email was rejected and how to fix it.
OpenFull DNS check
SPF, DKIM, DMARC and MX at once, with the report by email.
OpenFree DNS check API
JSON, no key, CORS enabled.
OpenDo your website or app emails still leave from the hosting server?
SMTP Senpai is the MailSenpai SMTP relay: it signs your emails with DKIM on your own domain, gives you the DNS records to publish and checks them for you. Servers and data in the EU.