|Try using FinePrint. There's a trail version
that doesn't expire. It's limited to 8 pages and prints an ad at the bottom of the page but it might do
just what you want.
You could also copy/paste into a word processor and adjust the margins/fonts till it fits.
You could also save the email to a text file and use a program like
textprint (freeware), which prints
multiple pages on one sheet.