Your email is failing a test you can't see.
SPF, DKIM, and DMARC are three DNS records standing between your mail and the inbox. Check yours free — no signup.
Want us to watch this on a schedule and email you the moment something breaks? Start always-on monitoring — $19/mo.
What each check actually means
Lists which mail servers are allowed to send email for your domain. Without it, anyone can forge a message that looks like it's from you.
A cryptographic signature added to outgoing mail that proves it actually came from your domain and wasn't altered in transit.
Tells inboxes what to do with mail that fails SPF or DKIM — quarantine it, reject it, or let it through — and where to send you reports.
Checks whether your sending domain or IP has been flagged by major spam blocklists, which can silently tank your deliverability.
Frequently asked questions
Is this actually free?
Yes. The instant check is free, with no signup and no card — we don't store your domain or the results anywhere.
My email seems to work fine — why would I have a problem?
SPF/DKIM/DMARC issues rarely stop mail from sending outright. Instead they quietly push it to spam, or let it through with a warning banner — the kind of thing you only notice once someone tells you they never got your email.
I got a "Critical" or "Warning" result — what now?
Each result includes a specific fix underneath it — usually a DNS record to add or correct with whoever hosts your domain's DNS.
How is this different from always-on monitoring?
This is a one-time snapshot of right now. Monitoring re-checks daily and only emails you when something actually changes, so you find out the moment a fix breaks or a record expires.