DNS lookup
Inspect A, AAAA, MX, TXT, CNAME, NS, SOA, SRV and PTR records.
DNS lookup →Free All-in-One Tool
See the journey behind your email.
Follow each recorded server hop, pinpoint delays and review authentication and filtering results. Add a bounce message to investigate delivery errors.
From sender to receiver.
- Sending server
- Security gateway
- Mailbox server
An illustrated route. Your report shows the timestamps and evidence in your message.
Free Individual Tools
SPF policy explorer
Follow published includes and redirects, keeping the individual policies visible.
SPF policy explorer →SPF IP check
Evaluate the sending IP against an envelope-sender or HELO domain.
SPF IP check →DMARC checker
Inspect policy, alignment modes and reporting destinations.
DMARC checker →DKIM key inspector
Inspect a published RSA or Ed25519 key using its selector.
DKIM key inspector →Reverse DNS checker
Resolve PTR names and check that they resolve back to the supplied IP.
Reverse DNS checker →MTA-STS checker
Fetch the HTTPS policy safely and compare its patterns with published MX hosts.
MTA-STS checker →BIMI publication checker
Inspect default-selector BIMI publication and the relevant DMARC policy.
BIMI publication checker →TLS reporting checker
Inspect SMTP TLS reporting destinations alongside your transport policy.
TLS reporting checker →