Tools DNS checker
DNS checker
Free for subscribersSee what's stopping your email reaching the inbox.
Inspect your domain's email and security settings in plain English: SPF, DKIM, DMARC, MX, MTA-STS, blocklists and when the domain expires. If something is missing, we give you the exact record to copy and paste where you manage your domain.
- Plain English, no jargon
- The exact record to copy
- Free for subscribers, up to 20 a day
Built with Workers, DNS over HTTPS
Subscribe free to use the DNS checker, up to 20 a day. Subscribers can use every tool on paulobrien.dev and hear when there's something new.
Only the domain name is checked. Nothing about your email is read or kept, and reports are deleted after 7 days.
brightwell.co.uk
// what it checks
What you get.
Who can send as you
SPF, DKIM and DMARC, read the way a receiving mail server reads them, with the fix spelt out.
Where your mail goes
MX records, the provider behind them and whether MTA-STS keeps mail encrypted on the way in.
Trouble spots
Ten blocklists, the domain's expiry date and the registrar, so nothing lapses quietly.
// how it works
Three steps.
- Type your domain
Just the domain, such as yourcompany.co.uk. You never sign in to your domain or your email.
- Get a score out of 10
Every record is read the way a receiving mail server reads it, with a plain English verdict on each.
- Copy the fix
Anything missing or wrong comes with the exact record to add where you manage your domain.
// questions
Good to know.
Do I need to give you access to my domain?
No. The DNS checker only reads the public records anyone can look up. You never sign in to your domain or your email.
Why does this matter?
Gmail, Yahoo and Microsoft now expect SPF, DKIM and DMARC to be set up properly. If they're missing or wrong, your email is more likely to land in junk or be turned away.
What does it cost?
Nothing. Subscribe free to paulobrien.dev and you can run up to 20 a day, and use every other tool on the site.
// more tools
More tools I've built.
Mail tester
Send one email to a test address and get a spam score out of 10, with what to fix.
Try itDMARC report reader
Upload DMARC report files and see who sends email as your domain, and whether it passed.
Try itWhois lookup
See who's behind a domain that emails you, and when your own email domain is due to expire.
Try itStay in the loop
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