Part of MikeNetworks®

Free tool

Where did this email come from, and where was it slow?

Paste the full headers (in most mail programs: "show original", "view source" or "message details"). You get the servers it passed through in order, the time spent at each, what the receiving server concluded about SPF, DKIM and DMARC, and whether the visible sender matches the technical one.

What this checks

Reading Received lines

Every server that handles a message adds a Received: line at the top, so the bottom line is the first hop and the top line the last. Each names the server it got the message from, the server that added the line, the protocol and a timestamp; the difference between consecutive timestamps is the time the message sat at that hop. Authentication-Results is added by the final receiver and records its own SPF, DKIM and DMARC verdicts. Lines below the first Received: were set by the sender and can say anything.

Related tools

More in this set

  • Mail DNS check MX, SPF, DKIM, DMARC, MTA-STS and TLS-RPT in one run.
  • SPF check Every mechanism explained, includes followed, lookups counted.
  • DKIM check The key behind a selector: type, length, flags.
  • DMARC generator A correct DMARC record from a few choices.
  • MTA-STS check The DNS records behind MTA-STS and TLS-RPT.

All tools Glossary

Mailboxes in Luxembourg

Need a mail provider that sets these for you?

NovaNode Mail gives you the MX, SPF, DKIM and DMARC records to copy into your DNS, with mailboxes stored in Luxembourg.

See NovaNode Mail