PocketKnife Peek is an Outlook add-in for screening your e-mail as plain text before opening it in Outlook. The add-in can be used to view all Outlook message formats, but is aimed particularly at averting the threats lurking in HTML mail. A convenient tabbed view lets you easily examine the:

• Message in plain text,
• HTML source (if any), 
• Internet header, and
• Attachments.

Key Features:

• Screen incoming messages without opening them in Outlook
• Converts HTML messages to plain text
• Review HTML source without using Notepad or opening the message
• Examine Internet header with one click
• See destinations of links in HTML messages
• View list of attachments (including the contents of ZIP files)
• Reply to and forward HTML mail in plain text
• Reply to Some feature gives greater control over who replies are addressed to
• New Full ribbon integration with Outlook 2010 and 2013
• Read more

Vital
Statistics

• PocketKnife Peek is a COM add-in that works with Outlook 2000 - 2013 (32-bit only)
• PocketKnife Peek is compatible with all versions of Windows (32- or 64-bit) that run Outlook, including Windows 8.
• You do not need to install PocketKnife in order to run PocketKnife Peek.
• PocketKnife Peek is free for personal use and for registered users of PocketKnife. Multi-user licenses are available for businesses. Click here for details.
• Works with the Outlook E-mail Security Update. No annoying warnings when looking up contact information.
• Note: PocketKnife Peek does not work with Outlook 97, Outlook 98, or Outlook Express.