Load the file into a word processor instead of using your system text editor or mail reader. Text editors are intended for the creation and editing of small text files such as scripts or program code that is to be linked to other code at compilation time.
Larger documents are the domain of word processors.
Any word processor should do. I have used both WordPerfect and ClarisWorks on the Mac to read the digest. Currently, I am using WordPerfect because it allows me to reformat the text with a macro. My macro removes the hard carriage returns, changes the point size of the text for easier onscreen reading and then adjusts the margins so that the text will fill my screen. I will share this macro with anyone who is interested.