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Occasionally, Support may ask you for internet headers of an email (also known as email headers). They contain information about the path of the email message, the spam score, authentication results and other useful data. This data is important for troubleshooting purposes. If you want to analyze the headers yourself, you can use any online headers parser tool, for example, MXToolbox.
Important: Email headers are unique for every email and are completely rewritten when the email is forwarded so it is important to retrieve the headers for the original email as it was received by the initial recipient.
What the Internet headers look like:
Complete headers always have more than 5 lines and should have at least one received line. They should look something like this:
Received: from mail.somedomain.name ([192.168.182.35]) by mail.yourdomain.name with Microsoft SMTPSVC(5.0.2195.5329);
Mon, 19 May 2003 20:58:16 -0700
Received: from SomeGuy (unverified [255.255.255.255]) by mail.somedomain.name (Rockliffe SMTPRA 4.5.6) with SMTP id <B0227914922@mail.somedomain.name> for <you@yourdomain.name>
Mon, 19 May 2003 20:28:12 -0700
Message-ID: <000d01c31e7f$d5f94970$23b693cc@JAB>
Reply-To: "TEST" <testbox@thisisadomain.name>
From: "TEST" <testbox@thisisadomain.name>
To: <you@yourdomain.name>
Subject: test
Date: Mon, 19 May 2003 20:28:09 -0700
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_000A_01C31E45.2981E060"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
Return-Path: testbox@thisisadomain.name
X-OriginalArrivalTime: 20 May 2003 03:58:16.0450 (UTC) FILETIME=[0AEFA620:01C31E84]
------=_NextPart_000_000A_01C31E45.2981E060
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
------=_NextPart_000_000A_01C31E45.2981E060
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
------=_NextPart_000_000A_01C31E45.2981E060--
Most mail clients have ways of retrieving complete Internet headers. Below are instructions for the most popular mail clients that allow you to retrieve them from a message. If your mail client is not mentioned, refer to your mail client's Knowledge Base or Support team for information on how to retrieve the headers.
Select your version of the mail client or Webmail:
Outlook for Windows:
Outlook 2013/2016/2019/365/2021:
Open the message in a new window, go to File > Info > Properties and look into the Internet headers field.
Outlook 2010:
Open the message and go to File > Info > Properties and look into the Internet headers field.
Outlook for Mac
Right-click on the message and click on View Source:
Outlook Web Access
Outlook Web App 2016/2019:
Open the message in a new window or highlight it, click on the little arrow located in the top right-hand corner of the message and click on View Message Details:
Outlook Web App 2013:
Open the message in a new window, click on Settings and click on View Message Details:
Other Mail Applications:
Mac Mail:
Open the message and go to View > Message > All Headers or Raw Source:
Thunderbird:
Double-click on the message and go to View > Message Source:
RoundCube:
Select the message and choose More Actions and then go to Source:
