Are your emails quietlylanding in spam?
One expired DNS record or blocklisted IP is all it takes — and nobody warns you. Get a clear verdict on your domain in 60 seconds.
Enter the domain you send from — the verdict is instant.
Free · instant verdict · no email needed to see it
These four decide where your email lands. None of them will tell you when it's spam.
Deliverability doesn't fail loudly. It decays.
No bounce message. No error. A DNS record expires, an IP lands on a blocklist — and your emails start disappearing into spam folders while your dashboard says "sent."
Emails reaching the inbox
one broken record, twelve weeks
A DNS record breakssilently
Rerouted to spam
You notice — weeks later
By the time open rates give it away, you've paid for weeks of emails nobody saw.
The campaigns still went out. The invoices still came. The list you spent years building just quietly stopped hearing from you.
Unless something is watching.
Inbox Decay re-checks your sending setup around the clock. The moment a record breaks or an IP gets listed, you get an email that says exactly what broke and when — with the AI fix one click away, before it costs you.
Check my domain→Inbox Decay · Break alertTue 09:14
Your DMARC record broke overnight. Gmail has started rejecting your newsletters. The break, the timing, and the fix are on your dashboard.
Caught the same afternoon it broke
No DNS knowledge required. Ever.
You don't need to know what a DKIM selector is. You need to know whether your emails arrive.
Enter your domain
We run your basic domain health check on the spot — the records receivers verify, and the blocklists they consult. A verdict before you've finished reading this page.
Send one test email
That unlocks the full health check: from every tool you send with — your ESP, your CRM, your outreach tool — we uncover the route each email really takes and what the filters see.
We watch it from then on
Your setup gets re-checked on schedule, forever. The moment anything breaks, you get an email that says exactly what broke and when — with the AI fix one click away.
We check everything the filters check.
If it can be verified from the outside, we verify it. Our own sending domain passes every one of these — we monitor it with our own product.
We measure the layer that can be measured. No fake seed tests. No inbox-placement theater.
Sending 50 emails a month? You're exactly who this is for.
Most deliverability tools have a volume floor. Ours doesn't: your DNS records can be verified without sending anything, and one email to your private test address carries everything else. The verdict is as complete for a monthly newsletter as for 50,000 sends a day.
Google Postmaster Tools
Shows “No data to display” until you send serious daily volume to Gmail. A monthly newsletter never fills that dashboard.
DMARC report tools
Build their picture from aggregate reports mailbox providers send back. At low volume those trickle in for weeks, and the picture stays partial.
✓Inbox Decay
One email. The route it took, the signatures receivers verified, what the filters saw, plus every domain check with no email at all.
The monitoring is tuned for monthly senders too: a quiet sender isn't written off until 45 days without an email, because a monthly newsletter isn't dead. It's monthly.
Questions, answered plainly.
Do I need any technical knowledge to use Inbox Decay?
No. You never need to know what a DKIM selector is — you get a plain-English verdict on whether you're good to send, and when something needs fixing, the exact record to add with step-by-step instructions for your DNS provider.
What exactly does Inbox Decay check?
Everything about your sending setup that can be verified from the outside: SPF records and syntax, DKIM keys, DMARC policy and alignment, MX records, DNS health, reverse DNS, TLS in transit, the spam blocklists filters consult, plus message-level checks like one-click unsubscribe and content weight on the test emails you send us — 21 checks in total.
Why do email setups break over time?
Because nothing holds still: DNS records get edited or expire, agencies and tools add or remove records, providers rotate keys, mailbox providers tighten requirements (like Gmail and Yahoo's bulk-sender rules), and shared IPs get blocklisted. Each break is silent — your emails just quietly stop arriving — which is why one-time checks aren't enough and we keep watching.
Does Inbox Decay read my email?
No. We check public DNS records and the one test email you deliberately send to your private test address. We never connect to your inbox and never see your correspondence.
What does the free plan include?
The free check is genuinely free, no card required: one complete health check per domain — the full verdict, every finding, and the live-send half through your test address. We keep watching afterwards and email you when something changes; seeing exactly what changed, re-checking on demand, and every fix live on the paid plan.
How is Inbox Decay different from mail-tester or MXToolbox?
Three ways: we give one plain-English go/no-go verdict instead of a technical table; we check the tools you actually send with (Mailchimp, Kit, Klaviyo and 30+ more) against what those tools specifically require; and we don't stop after one check — we keep re-checking forever and email you the moment something breaks.
Does Inbox Decay work for low-volume senders?
Yes, and it's built for them. Our checks have no volume floor: your DNS records are verified without sending anything, and one email to your private test address unlocks the rest. Google's Postmaster Tools shows 'No data to display' without serious daily volume to Gmail, and DMARC-report tools need weeks of aggregate reports; a monthly newsletter never fills either dashboard. One email fills ours.
What is email deliverability?
Email deliverability is whether your emails actually reach the inbox instead of the spam folder or nowhere at all. It rests on a measurable foundation — authentication records (SPF, DKIM, DMARC), DNS health, and blocklist status — and that foundation is what Inbox Decay verifies and watches.
Find out where you stand.
60 seconds. If everything's healthy, we'll tell you that too — and keep watching in the background.
Free · instant verdict · no email needed to see it