Email Authentication
MX record check
MX records tell the internet which servers receive email for your domain. Wrong or missing MX means lost mail.
Check this on your own domain now. It is free with a DomainGuard account and works on any domain. The check reads only what your domain publishes, and gives you a report you can send to whoever runs your website.
What we look at
We look up the MX records for your domain, list the mail servers they name in priority order, and recognize Microsoft 365 and Google Workspace behind them. A null MX ("0 .") is read as a deliberate "this domain takes no mail".
Why it matters to your business
If your MX records point at an old provider, a typo, or nothing, email sent to you bounces or silently disappears. Customers, vendors and password-reset emails all stop arriving. A domain that deliberately takes no mail should say so with a null MX, which also stops it being used for spoofing.
How to fix it
- Check that the MX records match what your current mail provider says they should be.
- Remove MX records for providers you have left.
- If the domain never receives mail, publish a null MX (priority 0, target ".") and an SPF record of v=spf1 -all.
If you would rather not touch DNS or server settings yourself, forward this page and your report to whoever manages your website, or ask us to do it.
Keep an eye on it
A one-off check tells you how things stand today. On Starter and up, DomainGuard re-checks the domains it watches every day and alerts you in the app when something important changes, so you hear about it before a customer does.