Cómo usar: 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.
También se busca como: email header parser, analyze email headers, email header checker, trace email, email delay analyzer, check spf dkim dmarc, find email sender ip, message header analyzer.
Herramientas que combinan con: 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.
- Búsqueda en WHOIS — Introduce un dominio para ver su registrador, las fechas de creación y caducidad, la antigüedad del dominio, los códigos de estado, los servidores de nombres y el DNSSEC; o bien, introduce una dirección IP para averiguar a qué red y organización pertenece.
- ¿Cuál es mi IP? — Tu dirección IP pública y toda la información que tu navegador revela a las páginas web que visitas: agente de usuario, resolución de pantalla, idioma, zona horaria y encabezados de solicitud.
- 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.
Preguntas frecuentes
How do I find the full headers of an email?
Gmail: open the message, click ⋮ and choose Show original. Outlook: open it, then File → Properties → Internet headers. Apple Mail: View → Message → All Headers. Copy everything above the message body.
How do I find where an email was sent from?
The analyzer shows the originating IP: the first external server in the Received chain. Webmail services often hide the sender’s own IP and show their server instead.
Why was my email delayed?
Look at the hop with the largest delay. Minutes at the receiving side often mean greylisting or spam scanning; a delay on the sender’s side means a queue or a retry after a temporary error.
Are my headers uploaded?
No. They are parsed in your browser and never sent anywhere — important, because headers contain addresses and server details.
¿Puedo instalar Email Header Analyzer como aplicación web y utilizarla sin conexión?
Sí. Email Header Analyzer es una aplicación web instalable (PWA): se instala desde el navegador, no se descarga desde una tienda de aplicaciones. Haz clic en «Instalar aplicación» en la parte superior de esta página en Chrome o Edge (Windows, macOS, Linux, ChromeOS) o, en Android, utiliza «Compartir» → «Añadir a la pantalla de inicio» en iPhone y iPad, o «Archivo» → «Añadir al Dock» en Safari 17+ en un Mac. A continuación, se abrirá en su propia ventana con su propio icono y, como se ejecuta íntegramente en tu navegador, seguirá funcionando sin conexión. Firefox en el ordenador de sobremesa no permite instalar aplicaciones web. Cómo funciona la instalación.