Verify addresses, find out why mail goes to spam or bounces, and fix SPF, DKIM, DMARC, MX, SMTP and blacklist issues — with step-by-step instructions for your DNS provider.
Pick the symptom. We run every relevant check and hand you a prioritised fix plan — including the exact DNS records and where to click in Cloudflare, GoDaddy, Namecheap, cPanel and more.
One platform instead of a dozen tabs. Every check explains what it found, why it matters and how to fix it.
Verify single addresses or upload millions. Syntax, domain, MX and SMTP mailbox checks, catch-all, disposable and role-account detection with a risk score for every address.
| 203.0.113.25 | Clean | 2h ago |
| mail.yourcompany.com | Listed | alert sent |
| yourcompany.com | Clean | 5h ago |
Schedule blacklist checks for your IPs and domains and get an email the moment something changes. Automate everything with a clean REST API.
Enter a domain, IP, email address, headers or a bounce message — or simply pick the problem you have.
DNS, SPF, DKIM, DMARC, MX, SMTP, TLS, reverse DNS, blacklists and reputation — in parallel, in seconds.
Prioritised steps with copy-paste records and instructions for your DNS host. Re-check with one click.
Step-by-step answers to the questions people search for most.
No one can. Gmail, Outlook and Yahoo also use private signals such as engagement and complaint rates. We test every technical factor we can measure and show a Technical Deliverability Score — and we clearly mark anything we could not verify as UNKNOWN instead of guessing.
You can try 3 checks free, no card needed. After that, pick a credit package for unlimited use, bulk checks, monitoring and the API. Credits never expire.
Never. Mailbox verification and SMTP tests only open a connection and ask the server questions — no message is ever delivered, and we never log in to anyone's server.
SPF lists the servers allowed to send for your domain, DKIM adds a cryptographic signature to each message, and DMARC tells receivers what to do when both fail and sends you reports. Since 2024 Gmail and Yahoo require them for bulk senders.
Some lists refuse lookups from public DNS resolvers or limit volume. Instead of pretending you are clean, we show those lists as unknown.
Create a free account and get your first full domain health report in seconds.
