So nutzt du: Email Header Analyzer
- Open the email and copy its full headers: in Gmail use ⋮ → Show original; in Outlook File → Properties → Internet headers; in Apple Mail View → Message → All Headers.
- Paste them into the box — the analysis appears immediately.
- Read the summary: sender, the SPF / DKIM / DMARC verdicts and any warnings about spoofing.
- Look at the hops from first to last server to find where a delay happened, and the originating IP.
Reading email headers
Every mail server that handles a message adds a Received: line at the top, so the headers list the journey in reverse. The analyzer turns them around, works out the time between each hop and highlights slow ones — a delay of minutes usually points at a spam filter, greylisting or a queue on that server.
| Check | What it proves |
|---|---|
| SPF | The sending server’s IP is allowed by the sender domain’s DNS record |
| DKIM | The message was signed by the domain in d= and wasn’t changed on the way |
| DMARC | SPF or DKIM passed for the same domain as the visible From address — the key anti-spoofing check |
Signs of phishing
Be careful when DMARC fails, when the Reply-To or Return-Path uses a different domain than From, or when the display name claims to be a company the address doesn’t match. To check your own domain’s records, use the Email DNS Checker.
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Passende Tools zu: Email Header Analyzer
- DNS Lookup — Query all common DNS record types for a domain in one go, with TTLs, sorted MX records and an SPF/DMARC email-authentication summary.
- WHOIS-Abfrage — Gib eine Domain ein, um den Registrar, das Erstellungs- und Ablaufdatum, das Alter der Domain, Statuscodes, Nameserver und DNSSEC anzuzeigen – oder eine IP-Adresse, um das Netzwerk und die Organisation zu finden, denen sie gehört.
- Wie lautet meine IP-Adresse? — Deine öffentliche IP-Adresse und alles, was dein Browser den von dir besuchten Websites preisgibt – User-Agent, Bildschirmauflösung, Sprache, Zeitzone und Request-Header.
- HTTP Header Checker — Fetch any URL and see exactly what the server sends back — status code, redirect chain and every response header, with a plain-English explanation of the ones that matter for SEO, caching and security.