Stop email deliverability
problems before they start.
SPF gaps, broken DKIM, missing DMARC, misconfigured MX.
Find out in seconds, not hours.
How it works
Three steps, no faff.
No account, no configuration. Results come back in a few seconds.
01
Drop in a domain
Any domain you send from. Doesn't have to be your own.
02
See what's wrong
SPF, DKIM, DMARC, MX — each one checked and clearly labelled pass, fail, or needs attention.
03
Fix issues before they bite
Every failed check comes with a plain-English explanation and the exact fix to apply.
What we check
Everything that affects whether your email actually arrives.
If your DNS is misconfigured, email breaks — silently. Mail Radar checks every record that matters and tells you what's wrong.
SPF Record
Makes sure the right servers are allowed to send on your behalf. We check syntax, lookup count, and that your sending infrastructure is actually covered.
DKIM Record
Verifies your domain is signing outbound mail. We check for active selectors and that signing is set up correctly.
DMARC Policy
Controls what happens to mail that fails SPF or DKIM. We check policy strength, reporting addresses, and alignment.
MX Records
The records that tell the world where to deliver your email. We check they exist, resolve, and are in the right order.
MTA-STS
Tells receiving servers to only accept encrypted connections. We check whether you have this set up and whether the policy is valid.
Deliverability Report
A breakdown of every check — what passed, what didn't, and what to fix first.
62% of domains have no SPF record
82% have no DMARC
Source: Fortra, Q2 2025 · top 10M domains
Mail Flow Intelligence
See exactly where your email went — and what touched it along the way.
Paste raw email headers and we'll trace the full journey — sending server, security gateway, recipient. Works with Mimecast, Proofpoint, Barracuda, M365 Defender, and most other gateways. Useful for debugging delivery issues and spotting when a gateway has quietly broken your DKIM signature.
Plans
Free to use. Paid plans on the way.
The core checker is free, and the intention is to keep it that way. Paid tiers for monitoring, reporting, and API access are coming — features and pricing may change before launch.
Free
£0 forever
No account needed. Just use it.
- ✓ Domain checks
- ✓ SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, BIMI
- ✓ Email header analysis
- ✓ Mail flow intelligence
Pro
Coming soon—
Business
Coming soon—
Team
Coming soon—
API teaser
Build email checks into your own tools.
The Mail Radar API returns a structured breakdown for any domain. Good for onboarding flows, scheduled checks, or building your own dashboards.
Example endpoint
GET /v1/audit?domain=example.com
API access is included in the Team plan.
{
"domain": "example.com",
"status": "healthy",
"spf": {
"status": "pass",
"record": "v=spf1 include:_spf.google.com ~all"
},
"dkim": {
"status": "pass",
"selector": "google",
"aligned": true
},
"dmarc": {
"status": "fail",
"record": "v=DMARC1; p=none; rua=mailto:[email protected]",
"recommendation": "Move policy to quarantine or reject"
},
"mx": {
"status": "pass",
"hosts": ["aspmx.l.google.com"]
},
"ptr": {
"status": "pass"
}
}