No MX records

What it means

example.com publishes no mail exchangers, so no one on the internet can deliver mail to it, including replies to mail you send, and the DMARC reports you asked for.

How to fix it

Add MX records pointing at your mail provider. If example.com is genuinely send-only, publish a null MX instead: a single MX record with priority 0 and a target of ".", that states the intent explicitly.

Check your own domain

This page describes the condition. To find out whether your domain has it, run the MX test or the full checkup, which examines every record at once.

Understand it properly

This page covers one condition. For the whole picture, Why mail lands in spam, in the order worth checking, or start at the Health Library.

Where this comes from

We judge this against RFC 5321 section 5.1. Every finding on this site cites the specification behind it so you can check the work rather than take our word for it.

Other MX conditions

• Domain declares that it accepts no mail
• MX record points at an IP address
• A mail exchanger is a CNAME
• Only one mail exchanger, on one address
• A mail exchanger has no address