Honestly, IMO your very safest bet is to take whatever you want to send, copy it out of Word (or whatever), using either right-click, copy or CTRL+C, and paste it (right-click, paste or CTRL+V) into Notepad.
That will give you a completely unformatted document.
Then, just so you know exactly what you're working with, turn "Word Wrap" off.
Each of those incredibly long lines that you see will be a paragraph. Separate each line with a retrun to get a blank line between each paragraph. Notepad will respect carriage retruns, but don't try to use tabs to fake in paragraph indents or it will drive you crazy.
Now that you've got a bunch of long lines of text separated by blank lines, turn "Word Wrap" back on so you can see what you have.
Once you're happy with that, hit CTRL+A to select it all, CTRL+C to copy it, and then CTRL+V to paste it into any outbound email that you have prepared.
Send it to your own email addresses first (I'd recommend looking at at least two or three), just so you can get a good look.
Notice that the paragraphs should size properly to any email reading format that you open it in. It will do especially well in Outlook, as it will resize on the fly as you resize the window. It should also look fine posted into any web reading format ... like one of these posting windows, for example.
That shoud do it. Let me know how it goes?