Send a real email through our test inbox and get a 0–10 score with SPF/DKIM/DMARC, spam-engine, content and blocklist analysis — plus AI feedback on your subject, body, and audience. Then watch your sending IPs and domains across 66 blocklists 24/7.
No credit card. 1 free Deliverability Test, no signup needed for share-link previews.
From: hello@yourcompany.com
Onboarding-style transactional email. Clear, friendly tone. Subject is on-brand; consider trimming the emoji for stricter spam filters.
Know why an email lands wrong. Know the moment your reputation changes.
Send a real email to a unique test address. In under a minute you get a 0–10 score, every signal that influenced it, and an AI critique of the message itself — subject line, body length, audience tone.
Add the IPs and domains you actually send from. We check every major blocklist every few hours and surface authentication or DNS drift the moment it appears.
Tools that only check your DNS records can't tell you why a particular newsletter lands in spam. We score the actual message. You send it to us; we parse the raw MIME, run authentication checks, score it through a production spam engine, audit the content, look up your sender IP across 66 blocklists, and stitch it all into one verdict.
Click Start test — we hand you a unique …@check.clearbounce.net address that's valid for 72 hours.
From your actual sending tool — Postmark, SES, your Mailchimp campaign, Gmail, anything. We see every header your recipients would see.
In under a minute the dashboard refreshes with a score, every contributing signal, and an AI breakdown of what to change.
Authentication
SPF, DKIM, DMARC verdicts pulled from the receiving server's own checks — not re-validated at scan time, so historic key rotations don't lie.
Spam engine
Rspamd with 100+ rules — DNS reputation, body heuristics, header consistency. Same family as the engines running at large ISPs.
Content best-practices
HTML & plain-text alternative, image-to-text ratio, link count, List-Unsubscribe, URL shorteners, Reply-To mismatch.
Blocklist on the sending IP
66 IP-type blocklists including Spamhaus, Barracuda, SORBS, SpamCop, UCEPROTECT, Mailspike — weighted by reach so noisy listings don't dominate the score.
AI critique of the message itself
Reads your subject and body. Comments on email type, tone, length, CTAs, then suggests a better subject line, ideal body length, and a tighter audience fit when applicable.
Every test we run includes a copy & strategy review from a senior deliverability+copywriting model — not a generic spam tip. It reads what you actually sent.
Flags subjects that are too generic, salesy, ALL-CAPS or too long. Offers one or two paste-ready alternatives that better match your sender identity.
References norms for the email type it detected — cold outreach ~50–125 words, newsletters ~150–300, transactional ~30–100 — and tells you where you over- or under-shoot.
Reads tone, language, CTAs and signature; flags mismatch with a likely audience ("tone is too casual for B2B execs"; "no clear next step for newsletter readers").
A blocklist listing or DKIM rotation can quietly cut your inbox rate in half. We watch every IP and domain you add — across 66 major blocklists and at the DNS level — and email you the second something shifts.
Spamhaus and Barracuda matter more than a regional list. We weight by real-world impact, so noisy listings don't drown out the urgent ones.
Loses your SPF include? DKIM selector goes 404? MX flipped to a misconfigured fallback? You get the alert before your recipients do.
Each alert names the asset, the blocklist, severity, and links straight to the delisting page where applicable. Strict opt-in — no surprise digests.
When an asset turns yellow or red, we generate a short summary explaining which signals matter, what the likely root cause is, and what to do first.
Every status change is logged with timestamps so you can correlate "things broke after Tuesday's deploy" without guessing.
Lifecycle marketers, deliverability consultants, ESP-migrators, indie founders.
Every test gets a public share link (auth-free, read-only, masked PII). Drop it in a Slack message or a client report — no screenshot dance.
Raw email bodies are wiped automatically. You decide what's worth keeping; we don't sit on customer mail indefinitely.
No default-on inbox-spam. You explicitly subscribe each address to monitoring alerts; account email never gets used as a fallback recipient.
1 free Deliverability Test on signup. Paid plans from $12 / month with monthly test quotas and unlimited monitoring.