MX record checker
Updated
MX records tell the world which servers receive mail for a domain. Lower priority numbers are tried first.
Looks up public DNS only. Nothing you enter is stored.
What the checker tests
- That at least one MX record exists, or that a null MX is deliberately set
- That each MX host resolves to an IPv4 or IPv6 address
- That no MX target is a raw IP address or a CNAME, both of which break the standard
- Whether there is only one host and so no fallback
Why it matters for sending
When you send transactional email, replies, out-of-office messages and some bounces return to your domain. If you send from notify.yourdomain.com with no MX, those messages are lost, so set either real MX records or a null MX to say clearly that the subdomain receives nothing. Inboxili's custom MAIL FROM subdomain uses its own MX record, shown in the Deliverability Center.
Frequently asked questions
- Does my sending domain need MX records?
- To send you do not strictly need them, but a domain without MX cannot receive replies or bounces, and some receivers check that the From domain can receive mail.
- What is a null MX?
- A single MX record with priority 0 and an empty host (RFC 7505). It states that the domain accepts no email, which is correct for domains used only to send.
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