SPF
Whether the sending server is authorized for your domain.
Free · No sign-up · Nothing stored
Test your email deliverability
Send an email to your unique address and see how inboxes judge it: SPF, DKIM, DMARC, sending server and spam score.
Get a unique address, send your real email to it from your mail client or sending platform, and we'll show exactly how receiving servers see it.
The address works for 60 minutes and accepts one message.
Send your email to
How it works
- Generate an addressA unique, temporary inbox just for your test.
- Send your emailFrom the same account or platform you use for real campaigns.
- Read the reportResults appear here automatically, usually within seconds.
What we check
DKIM
Whether the message is signed and the signature verifies.
DMARC
Whether SPF or DKIM aligns with your From domain, and your policy.
Sending server
Reverse DNS and public blocklists for the delivering IP.
Sender domain
A/AAAA, MX, SPF, DMARC and DKIM records of your From domain.
Spam score
SpamAssassin's verdict on your actual message.
What we check
A / AAAA
The domain resolves to an IPv4 or IPv6 address.
MX
Mail servers, their priorities, and whether each one resolves.
SPF
One valid record and how strictly it treats unlisted senders.
DMARC
Your p= policy and whether aggregate reports are enabled.
DKIM
Signing keys published under the most common selectors.
Blocklists
Your mail servers' IPs against public DNS blocklists.
How it works
- Paste or uploadThe HTML body of the email you're about to send.
- We build a test messageWith standard headers, so only your content is judged.
- SpamAssassin scores itSee every rule that fired and how many points it added.
Content is analyzed in memory and discarded right away. Network-based tests (RBLs, Razor) are off, so the score reflects your content only.