How to Trace an IP Address from an Email Header

When investigating suspicious phishing messages, spoofed CEO fraud, or unexpected marketing spam, the visible From: address in your email client is easily forged.

However, the underlying email header contains an immutable chronological audit trail of every mail server that handled the message. By reading these headers, you can pinpoint the originating IP address.

Accessing Full Email Headers

To inspect the raw headers:

• Gmail / Google Workspace: Open the message → click the three vertical dots (⋮) near the Reply arrow → select “Show original”.
• Microsoft Outlook (Desktop): Double click the email to open in a window → File → Properties → examine “Internet headers”.
• Apple Mail: Select the email → press Shift + Command + H (or View → Message → All Headers).

How to Read Received: Headers

Email delivery follows RFC 5322. Every Mail Transfer Agent (MTA) that accepts a message inserts a new Received: header line at the very top of the header block.

Because headers are prepended at each hop:

• The topmost Received: line represents the final destination server delivering the message to your inbox.
• The bottommost Received: line usually represents the server that first introduced the email into the Internet.

Example Header Breakdown

Received: from mail-ed1-f41.google.com (mail-ed1-f41.google.com. [209.85.208.41])
    by mx.yourcompany.com with ESMTPS id 48a29b48
    for <[email protected]>; Sun, 01 Nov 2026 12:15:30 -0000
Received: from smtp-out.sender.com (smtp-out.sender.com. [198.51.100.84])
    by mail-ed1-f41.google.com with ESMTPS id xyz987
    for <[email protected]>; Sun, 01 Nov 2026 12:15:28 -0000
Received: from internal-client-pc (client-192-0-2-15.isp.net [192.0.2.15])
    by smtp-out.sender.com with ESMTP id 12345
    for <[email protected]>; Sun, 01 Nov 2026 12:15:20 -0000

Analyzing the Path:

1. Originating Sender: The bottommost entry shows [192.0.2.15]. This was the client device that composed or transmitted the message to smtp-out.sender.com.
2. First Relay Server: smtp-out.sender.com running on [198.51.100.84].
3. Delivery to Inbox: Transferred to Google’s receiving MX servers [209.85.208.41].

Copy the IP 198.51.100.84 or 192.0.2.15 and paste it into our IP Address Lookup tool to inspect who owns that server and which country it operates from.

Caveats and Modern Email Privacy

Webmail Clients (Gmail, Outlook.com, Fastmail)

If someone sends an email using Gmail’s web interface or official mobile app, Google strips the sender’s local residential IP address from the email header for user privacy. The earliest IP listed will be Google’s internal datacenter servers (209.85.x.x), not the sender’s home Wi-Fi IP.

Forged Internal Headers

Attackers can manually inject fake Received: headers inside the body text before sending. Always read upwards from the servers you know and trust (such as your own email provider’s initial receiving record) to establish a chain of custody.