View headers with Mozilla Thunderbird

GUIDES AND USEFUL INFORMATION > 02. E-mail > 05. Email and useful information

If you use Mozilla Thunderbird, once you have selected the message, from  the View menu select Message Source

You will then view the entire header as shown below:

To view the header more clearly, you can copy and paste the text in the Notepad, in a Word Processor or simply in a new email.