What is DomainKeys?
DomainKeys is an email authentication technology developed by Yahoo, and is primarily used as an additional anti-spam and anti-phishing method.
How DomainKeys works
How to check your mail server uses this technology correctly
- Sending emails
- The domain owner generates a public / private key pair to use for signing all outgoing messages (multiple key pairs are allowed). The public key is published in DNS, and the private key is made available to their DomainKey-enabled outbound email servers.
- When each email is sent by an account within the domain, the DomainKey-enabled email server automatically uses the stored private key to generate a digital signature of the message. This signature is embedded as a header in the sent email, and the email is sent on to the target recipient's mail server.
- Receiving emails
- The DomainKeys-enabled receiving email server extracts the signature and claimed From: domain from the email headers and fetches the public key from DNS for the claimed From: domain.
- The public key from DNS is then used by the receiving mail server to verify that the signature was generated by the matching private key. This proves that the email was indeed sent by, and with the permission of, the claimed sending From: domain and that its headers and content weren't altered during the transfer.
- The receiving email server applies the local policies based on the results of the signature test. If the domain is verified and no other antispam tests catch it, the email can be delivered to the user's inbox. If the signature fails to verify, or there isn't one, the email can be dropped, flagged or quarantined.
Send an email to the following randomly generated email address: HSFIIOJYQKCLDREFJUAX@dk.mailradar.com
Once you have sent your message, click the "View Results" button below to see your message results.
Please note that it may take a few minutes to receive the message.
Blacklist monitoring alerts
Signup for our real-time monitoring service and receive email notifications each time one of your IPs gets blacklisted.
Mail Server Operating System Poll
Get IP status, owner and location, obtain its corresponding hostname or check specific ports.
Open Relay Test
Test if your mail server is an open relay for spammers.
Check if your IP is listed in DNS based email blacklists (DNSBL)