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Complete Guideline to Perform Office365 Header Analysis

All the Emails start with an information line, which is known as Email Headers. It gives the complete details about its origin that systems from which it passes along with its useful information. All these information are mainly hidden from view when the user is opening and viewing their emails. They can only view the basic header information, i.e. from, date, time, subject, etc. The complete copy of emails helps to give extra information while performing the analysis of email header. In the following section, we will discuss the way to open and view the message header in Office365 mailbox.

How to View Office365 Message Header?

Some steps are mentioned below that makes easy for users to open and view message header of Office365 mailbox.

  • Open your Office365 mailbox and click on the mail, which is required to be viewed.
  • Now, click on the small arrowhead, which is just to the right of the reply all button.
  • Choose the view message details option from the drop-down menu list.
  • All the complete message header details will be viewed.

Office365 Message Header

Note: In the similar way you can also view the message details of Exchange in Office365 to investigate properly accordingly.

Analysis On Office365 Message Header

Emails cover the way for all kinds of attacks as well as infections to an organization. To deal properly with UCE and spam, in 0365 it is essential to find the underlying cause by reading out the email headers efficiently. On coming across the facts of the message, an investigator easily interprets the complete details of the message based on RFC 822 format that suitably describes the structure of emails. It verifies the formation or outlines the fields of the SMTP message header.

Extraction of Office365 Message Header Information

Received From: This service contains the field of Received header in every message processed. It includes the IP address of the sender and all the details of the Transport Layer Security (TLS). It means that the secure transmission from sending server from which particular server the message is processed. The digital signature is added, which let the system distinguish between the NDRs, it is the result from spammers by using forged address as well as a timestamp. The mail server may add the details to the header that indicates that the mail was received through TLS from security service. The digital signature is added for supporting Null sender disposition spam filter.

Office365 Email Header

From: This shows whom the message is from; however, this can be easily copied and can be the least reliable as well.

Subject: This is what the sender placed as a topic of the email content. It gives an idea about what is mail contains actually.

Date: This show the date and time the email message was composed. It makes easy for user to understand the main details about the composed date of the content.

To: This shows to whom the message was addressed, but may not enclose the recipient's address.

Return-Path: The email addresses for return mail. This is the same as "Reply-To" option in the mail we see. It makes easy as the user directly replies for their mentioned mail and it creates a kind of conversational way.

Mime-Version: It is the one that helps in specifying the edition of the MIME protocol, which was used by the sender for sending mail. Like the other MIME headers, this one is usually highly ignorable, however; most of the modern mail programs will do the right thing with it.

Analysis Office365 Email Header

Office365 X-Headers: An X-header is a user-defined as well as an unofficial header field. These are not exactly mentioned in RFC 2822 however; the utilization of an undefined header field that is starting with X- has become an accepted way of adding unofficial header fields in a message. All the messaging applications like antivirus, anti-spam, and messaging servers may add its own X-headers in a message. Whereas in Exchange, the X-header fields contain the complete details about the actions, which are performed on the message by the Transport service like the content filtering results, spam confidence level (SCL), and rules for processing status. Revealing all this information to unofficial sources that could pose a potential security risk.

Office365 Email Header Analyzer

X-Microsoft-Exchange-Diagnostics: This is to check the completely to check the proper connection as well as check the proper authentication. Sometimes, the mail is rejected then, it is used to perform the complete verification. It is completely responsible for fixing the problem.

Examine Office365 Email Header

It makes easy to perform the complete analysis of Office365 Email Header to find out the culprit.


While viewing office365 Email header perhaps is not a part of your typical day-to-day requirements, there are cases where some information contained in them can be quite valuable. After understanding the complete requirement of users from an investigation point of view, we have discussed the systematic procedure and detailed properly the way to perform Office365 Header Analysis. As well as Office365 email analyser provides advanced Email Search Software for finding any information in the emails easily.