How to get Email Header?

Apple Mail 2.x (Mac)

1. Select the message that you want to view the headers.
2. Press SHIFT-COMMAND-H to toggle full headers for the message. (Alternatively you can click VIEW in the menu bar, click MESSAGE, click LONG HEADERS)

Apple Mail 11.x/12.x/13.x/14.x (Mac)

1. Select the message that you want to view the headers.
2. Click View in the menu bar, click Message, click All Headers.

Microsoft Outlook 2003 (Win)

1. Select the message that you want to view the headers.
2. Right click the mouse, select OPTIONS.
3. Headers will be displayed within the "Internet Headers" area of a pop-up window.

Microsoft Outlook 2007 (Win)

1. Open the message that you want to view the headers in a new window.
2. Click the expansion button in the lower right corner of the Tags toolbar box(a small icon below the "Mark as unread".
3. Headers will be displayed within the "Internet Headers" area in a new dialog box.

Microsoft Outlook 2010/2013/2016/2019 (Win)

1. Double-click an email message to open it outside of the Reading Pane.
2. Click File > Properties.
3. Headers will be displayed within the "Internet Headers" area in a new dialog box.

Outlook.com (Formerly Hotmail)

1. Open the email that you want to view the headers.
2. Click the More icon and then select "View".
3. Select "View message source".
4. A new dialog box with the full headers and HTML source of the email will be opened.

Mozilla Thunderbird 2.x (Win)

1. Select the message that you want to view the headers.
2. Press CTRL-U. (or click VIEW from the menu bar, select MESSAGE SOURCE)
3. Headers will be displayed in a new window.

Mozilla Thunderbird 78 (Win)

1. Select the message that you want to view the headers.
2. Select View > Headers > All from the menu bar to display the full message headers.

Google Mail (GMail)

1. Open the message that you want to view the headers.
2. Click the More icon next to the Reply icon.
3. Select "Show Original".
4. A new window with the full headers and HTML source of the email will be opened.

Yahoo Mail New Version

1. Open the email that you want to view the headers.
2. Click the More icon and then select "View Raw Message".
3. A new window with the full headers and HTML source of the email will be opened.

Yahoo Mail Classic Version

1. Open the email that you want to view the headers.
2. Select "Raw Message".
3. A new window with the full headers and HTML source of the email will be opened.