Know why your email lands in spam.
Send one message to your test address. DeliverSight reads it the way mailbox providers do, scores authentication, reputation and content out of ten, and shows what failed and why.
Your test address
- Copy the address.
- Send any email to it from the system you want to check.
- Your report appears here once the message is received and analysed.
Allocating your test address…
No email handy? Check a domain's DNS instead
- Free, no account
- Results in minutes
- Every report is a link
example Sample report with demo data — not your result. Your own report replaces it once your message arrives.
Sample report — complete
Fix first: Content. List-Unsubscribe: missing List-Unsubscribe header
How it works
Test once. Fix what failed. Keep watching.
Testing is free and needs no account. Monitoring and DMARC analytics are what you pay for when you want to know before your customers do.
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Send a test
Any email, from any system, to your address. Eight checks run against a real receiving server: SPF, DKIM, DMARC, blocklists, spam scoring, content, linked domains and reverse DNS.
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Fix what failed
Every finding says what failed and why, problems first, with the evidence our receiving server recorded beside it. Monitored domains also get the exact record to change.
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Keep watching
Point DMARC reports at us and add monitors. New senders, record changes and expiring certificates reach you first.
Sample report — complete
Fix first: Content. List-Unsubscribe: missing List-Unsubscribe header
DMARC analytics
Every source that sends as your domain, in one view.
Point your DMARC reports at DeliverSight. We parse the XML so you don't have to: who sends as you, what fails alignment, and when it is safe to tighten your policy.
- Sources, namedGoogle Workspace, SendGrid, Mailchimp… and the networks you never authorized.
- Alignment, measuredSPF and DKIM alignment per source, with the fix next to the failure.
- Policy, when readyA readiness note tells you when p=quarantine or p=reject is safe.
| Day | Messages | Failed |
|---|---|---|
| 1 | 4300 | 936 |
| 2 | 4468 | 936 |
| 3 | 4410 | 863 |
| 4 | 4206 | 745 |
| 5 | 3971 | 616 |
| 6 | 2613 | 342 |
| 7 | 2593 | 311 |
| 8 | 3903 | 468 |
| 9 | 4074 | 489 |
| 10 | 4197 | 504 |
| 11 | 4169 | 500 |
| 12 | 3932 | 472 |
| 13 | 2300 | 276 |
| 14 | 1762 | 211 |
| 15 | 2457 | 295 |
| 16 | 2130 | 256 |
| 17 | 2089 | 251 |
| 18 | 2367 | 284 |
| 19 | 2910 | 349 |
| 20 | 2388 | 346 |
| 21 | 3038 | 510 |
| 22 | 4708 | 886 |
| 23 | 4905 | 1001 |
| 24 | 4816 | 1035 |
| 25 | 4508 | 991 |
| 26 | 4103 | 896 |
| 27 | 2534 | 534 |
| 28 | 2301 | 455 |
| 29 | 3438 | 618 |
| 30 | 3510 | 555 |
Explanations you can act on
Evidence on the left. The fix on the right.The evidence, then the fix.
No score without the evidence that produced it. Every report shows what the receiving server recorded for each check and what failed. The ordered fix list with copy-ready DNS records shown here comes with domain monitoring.
Authentication-Results: mx.deliversight.com;
spf=pass smtp.mailfrom=acme-corp.com;
dkim=pass header.d=sendgrid.net header.s=s1;
dmarc=fail (p=QUARANTINE sp=NONE dis=NONE)
header.from=acme-corp.com
_dmarc.acme-corp.com TXT
v=DMARC1; p=quarantine;
rua=mailto:rua@in.deliversight.com; adkim=r; aspf=r
- dmarc Align DKIM with your From domain.
Authenticate acme-corp.com in SendGrid and publish its CNAME selectors. Expected score after fix: 10.0.
- content Add one-click unsubscribe.
Enable subscription tracking in your sending service, or add List-Unsubscribe and List-Unsubscribe-Post yourself.
- then Re-test after the DNS change.
CNAMEs usually propagate within an hour. Send the same message again and compare the two reports.
Developers
Built to run from your own systems.
- Test from CICreate a test, send to the returned address, read the score back before you ship.
- Signed webhooksA result, a monitor change or a new DMARC source arrives as a signed POST.
- Share a report, not a screenshotEvery report is a read-only link with the evidence attached.
# allocate a test address for this send
curl -s -X POST https://api.deliversight.com/v1/tests \
-H "Authorization: Bearer $DELIVERSIGHT_API_KEY"
# → 201
{
"token": "ds-q6mdtt6rqbktzg74",
"address": "ds-q6mdtt6rqbktzg74@in.deliversight.com",
"source": "api",
"expires_at": "2026-08-03T05:46:54Z"
}
Developers and ops
DNS records, headers and a REST API. Run a test from CI before every release that touches email.
Marketing and lifecycle teams
A score you can read without a glossary, and the exact setting to change in your sending service.
Agencies and IT providers
Many domains, one view. Share a report link with a client instead of a screenshot.
Pricing
Start free. Upgrade when you're watching, not just checking.
Monthly prices; the free plan needs no card. Every paid plan starts with a 14-day free trial for first-time subscribers.
| Plan | Free €0/mo | Starter 14 days free €19/mo | Pro Most popular 14 days free €59/mo | Business 14 days free €129/mo |
|---|---|---|---|---|
| Domains | 1 | 3 | 10 | 30 |
| Tests / month | 90 | 250 | 1,000 | 3,000 |
| Team members | 1 | 2 | 5 | 15 |
| Domain monitoring | — | Included | Included | Included |
| Monitoring interval | 1,440 min | 360 min | 60 min | 15 min |
| Advanced monitoring checks | — | — | Included | Included |
| Monitoring webhook alerts | — | — | Included | Included |
| History retention | 30 days | 90 days | 365 days | 365 days |
| API requests / min | 0 | 0 | 60 | 300 |
| Start Free | Start Starter | Start Pro | Start Business |
€59/mo
- Domains
- 10
- Tests / month
- 1,000
- Team members
- 5
- Domain monitoring
- Included
- Monitoring interval
- 60 min
- Advanced monitoring checks
- Included
- Monitoring webhook alerts
- Included
- History retention
- 365 days
- API requests / min
- 60
Prices and limits are live from the plans we sell. See all plans and yearly billing →
Send one email. Know why.
Free, no account. The report is yours in minutes.