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If you need to send the information in the full headers of an email message (to report possible phishing or spam, for example):
- Follow the appropriate instructions below to first display the message headers.
- Microsoft Outlook for Windows: Double-click the message to open it in a new window. Select the File tab, and then, at the bottom, click Properties. The data is next to Internet headers.
- Outlook Web App (OWA): Double-click the message to open it. Click the options icon (three dots near the top right), and then click View Message Details.
- Outlook Express, Windows Mail, or Windows Live Mail (Windows): In the message index, right-click the message, and then select Properties. Click the Details tab.
- Outlook for Mac OS X: In your Inbox (or other folder), right-click or
control-click the message, and then select View Source.
- Thunderbird (Windows, Mac OS X): Click View, select Headers, and then choose All.
- Mail (Mac OS X): With the message selected, from the View menu, select Message, and then select either All Headers or Long Headers.
- Imail: Select the message, click the down arrow in the upper right corner, and then select View message details.
- Umail: Click the mail message to display it in the message pane. Next to "Reply", click the down arrow, and then click Show original.
- Copy and paste that information into the email message you wish to send.
From https://kb.iu.edu/d/adix