📨 Email Deliverability Test

See your email the way a receiving server does

When your email lands in spam, the cause is usually invisible from your inbox: an SPF record that does not cover the service sending for you, a DKIM signature that fails, a DMARC policy that tells receivers to reject anything unauthenticated. This test shows you those verdicts directly. Generate a one-time address, send it a message from the mailbox, website, shop or mailing service you want to check, and this page shows the authentication results recorded when your message arrived, plus the server that sent it.

What the three verdicts mean

SPF pass means the sending server is on the list your domain publishes. DKIM pass means the message carries a valid cryptographic signature from your domain, proving it was not altered on the way. DMARC pass means at least one of the two lines up with the domain your recipients actually see, which is the alignment receiving servers enforce. A fail on any one of them does not always mean spam, plenty of legitimate mail limps through, but each fail is a reason a strict receiver can demote or reject you, and together they are the first thing to fix before blaming your content or your list.

How the test handles your email

The test reads the headers of the message you send, the technical envelope every email carries, and records only the verdicts, the sender and the subject line. The body of your message is never stored. Results are deleted within 24 hours, and every test address is single-purpose and disposable, so send from a test account if your message contains anything sensitive.

Frequently asked questions

What should I send to the test address?

Any real message from the system you want to check: a test email from your mailbox, a password reset or order confirmation from your website, a campaign preview from your mailing tool. The verdicts describe that message's journey, so send the kind of mail whose deliverability you care about.

My verdicts pass here but mail still lands in spam. Why?

Authentication is the entry requirement, not the whole story. After it, receivers weigh your sending history, engagement, complaint rates and content. Passing SPF, DKIM and DMARC removes the technical reasons for rejection; what remains is reputation, which is built by sending mail people open and never buying lists.

How is this different from the SPF, DKIM and DMARC checker?

That tool reads the records you have published, the setup. This test reads a real message you sent, the outcome. Publishing perfect records with a sending service that does not sign properly still fails in practice, and this test is how you catch that.

Do you keep my emails?

No. The analysis keeps only header verdicts, the sender address and the subject for 24 hours so this page can show them to you, then deletes them. Message bodies are never stored at all.