Test the deliverability of your email
Send an email to the address below from the system you want to test. We'll check its reverse DNS, authentication, reputation and content, and give it a score out of 10.
First, send your email to:
generating…
How it works
- Send
Send a real message to the address above, from the server, app or mail client you actually use. Every message is accepted, however broken. - Check
Your results page updates live while we run the checks. It usually takes 5–20 seconds. - Fix & re-check
Fix DNS problems, then press Re-check. There's no need to send again.
What we check
Reverse DNS, both waysYour IP has a PTR record, the PTR hostname resolves back to the same IP, and your HELO name matches.
SPFRecord syntax, the 10-lookup limit, ?all/+all policies, and whether your IP is authorised.
DKIMEvery signature verified, with the cause of any failure diagnosed (body changed vs wrong key), plus key size and signed headers.
DMARCRecord, policy, alignment with your From address, and reporting addresses.
BlocklistsSpamhaus, Barracuda, SpamCop and more for your IP; Spamhaus DBL, SURBL and URIBL for your domains and links.
SpamAssassinA full SpamAssassin scan, with every rule that matched.
Bulk-sender rulesThe Gmail/Yahoo/Microsoft requirements: one-click unsubscribe (RFC 8058), alignment and signed headers.
Content & linksMIME structure, text/HTML versions, images, dangerous HTML and attachments, URL shorteners, phishing-style and broken links.
TransportSTARTTLS and TLS version, protocol mistakes such as bare line feeds and talking too early, and header hygiene.
Domain securityMTA-STS, TLS-RPT, BIMI, DNSSEC and DANE.
Messages, sender details and visitor IP addresses are stored and can be viewed by the operator of this service. Public result links expire after 7 days.