Kindle functions great as an offline email reader.
Install a PDF virtual printer (I use CutePDF at the moment).
Select your email from Outlook (should work with any email client).
If you are using Kindle 2 then Click File-Page Setup-Memo Style and set the page size to A5 and both font sizes to 12.
Print to the PDF printer.
Copy to the Kindle. Try my one step copy idea here:
https://www.mobileread.com/forums/showthread.php?t=72467
Enjoy!