Sometimes you may be asked to provide the internet headers or email message headers to your email hosts so that support can troubleshoot any problems.
Email message headers provide a list of technical details about the message, such as who sent it, what software was used, and the route it took. This information can provide valuable details on tracking an email source and how to it got to you, or why it never arrived at its intended source.
Here are details on how to get that information from different email software
Your email client program will usually hide the full header or display only lines, such as From, To, Date, and Subject, see below for more information on pulling headers for your email client:
- Outlook 2003
- Outlook 2007
- Outlook 2010
- Outlook Express
- Outlook 97
- Outlook 98
- Outlook 2000
- Outlook 2002
- Microsoft Exchange
- Zimbra
- Entourage
- Mac OS X Mail
- Outlook Express for Macintosh
- Gmail (works for Google Apps as well)
- Yahoo!
- AOL
- Hotmail
- Eudora
- Netscape, Mozilla or Thunderbird
- Lotus Notes
- Pine
- XtraMail
- Pegasus Mail
- Claris Emailer
- Mail Warrior
- Juno
- Novell Groupwise
- Thunderbird
If you want you can then analyze the header information using this tool from MXToolbox
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