Hotmail

Log into your Hotmail account.
Click on the Options link on the menu (it is next to the Contacts tab).
On the options page click on the Mail Display Settings link under the Additional Options column.
Look for the setting named Message Headers. Change the value to either Full or Advanced.
Click the Ok button on the bottom of the page to save the changes.
You can now go back to your Inbox and view your mail.
The mail you view will display the full headers.
Using the mouse, click and highlight the header text, then copy it to the clipboard by right-clicking and selecting Copy.
You can now paste it into an email by creating a new email, right-clicking the mouse, and selecting Paste.