DNSFly

Email Authentication Tools

Check your SPF, DMARC, and DKIM records to confirm your domain's email is protected against spoofing. Pick a tool to get started.

SPF Checker Validate the record that lists which servers may send your mail. DMARC Checker Check your policy, reporting address, and alignment settings. DKIM Checker Look up a DKIM public key by selector and confirm it is published.

Why email authentication matters

SPF, DMARC, and DKIM are three DNS records that together stop other people from sending email as your domain. Without them, a spammer can forge your address and your real mail is more likely to land in spam. With all three set correctly, receiving servers can verify your mail and reject forgeries.

SPF lists the servers allowed to send your mail. DKIM adds a cryptographic signature that proves a message was not altered. DMARC ties the two together, sets the policy for failures, and sends you reports. Each tool above checks one of them and explains what it finds.