What are email headers?

Every email message includes a block of text at the top that is referred to as the header. The header contains details about the message, including the sender's information, the recipient's information, the servers that handled the message as it traveled from the sender to the recipient, etc. However, many email clients don't display the header information by default.

To view the full header information using different email clients:

Outlook 2010

Outlook 2007 or older

Every email message includes a block of text at the top that is referred to as the header. The header contains details about the message, including the sender's information, the recipient's information, the servers that handled the message as it traveled from the sender to the recipient, etc. However, many email clients don't display the header information by default.

To view the full header information using different email clients:

Outlook 2010

Outlook 2007 or older

Outlook Express

Outlook Web Access

Windows Live Hotmail

Eudora

Netscape

Web-Based Email

Apple Mail

Outlook Express

Outlook Web Access

Windows Live Hotmail

Eudora

Netscape

Web-Based Email

Apple Mail