The mail servers that receive email for the domain have changed. If nobody planned it, email may now be going to someone else, or nowhere.
What it means
A domain’s MX records tell the rest of the internet which servers accept its email. Changing them is normal when you move to a new email provider, but an unplanned change can mean a mistaken DNS edit, a botched migration or a hijacked domain. Incoming email follows the new records as soon as they spread.
What triggers it
Once a day the DNS & email security check looks up the registered domain’s MX records through public DNS and compares them with the day before. Any difference raises this High issue, showing the old and new servers, and owners and admins are alerted once by email and chat.
The registered domain is what’s checked, so shop.example.com is covered through example.com. The issue stays on the website’s page for 7 days after the change.
Common causes
- Moving email to a new provider, such as Google Workspace or Microsoft 365.
- Moving DNS to a new host or changing nameservers without copying every record.
- Someone editing or deleting the wrong DNS record.
- Someone gaining access to the registrar or DNS account.
How to fix it
- Compare the new servers shown in the issue with the email provider you expect to use, and ask whoever manages the domain whether they made the change.
- If the change wasn’t planned, restore the previous MX records at your DNS provider, then send a test email to the domain.
- If nobody recognises the change, change the passwords for the registrar and DNS accounts, turn on two-factor sign-in and check the nameservers too. See Nameservers changed.
When it clears
This issue disappears on its own 7 days after the change, whether or not anything was done, so check it before then. Mark the action done once you’ve confirmed the change. Another change to the mail servers raises it again, with a new alert.