Email Header Analyzer Online

The Email Header Analyzer on 101IP parses the technical headers of an email: it shows the delivery route through mail servers, SPF, DKIM and DMARC verification results, and all technical metadata.

How to get email headers

Gmail: open email → three dots → "Show original" → copy all;
Outlook: open email → File → Properties → "Internet headers";
Apple Mail: View → Message → All Headers (Cmd+Shift+H);
Thunderbird: Ctrl+U or View → Message Source.

What you can learn from headers

the path of the email from sender to your mailbox — each server leaves its own Received record;
SPF check result — whether the sender's IP address is authentic;
presence and status of the DKIM signature — whether the email was altered in transit;
DMARC policy of the sender's domain;
the real IP of the sending mail server (useful when suspecting spam).

Frequently Asked Questions

How do I get email headers in Gmail?

Open the message in Gmail, click the three-dot menu next to the reply button and choose "Show original". A new tab will open with the full raw headers — copy the entire block and paste it into the analyser on 101ip.ru.
What should I do if the analyser shows SPF or DKIM failed?

First verify that the correct DNS records are published for your domain. For SPF, make sure your mail server's IP is included in the record. For DKIM, confirm the key matches the selector. If emails are landing in spam, set up a DMARC policy of "reject" as soon as possible.
Can the tool analyse headers from Outlook?

Yes. In Outlook Web, open the message, click the three-dot menu and choose "View message source". In the desktop app go to File › Properties › Internet headers. Copy the text and paste it into the form — the service processes Outlook headers just as accurately as Gmail ones.