Can you make a pdf newsletter and send it to your contacts?
If I am you. I would do like below:
1) put the pdf somewhere on your website. (like : www.yourwebsite.com/pdf/thepdf_file.pdf
2) save your 1st page of pdf file as jpg(eg. thepdf_file.jpg) you can also put a wording say "click me to get the detail".
3) add the thepdf_file.jpg file and link to "www.yourwebsite.com/pdf/thepdf_file.pdf"
once when the recepient receives your email...it shows the pdf cover page and directs he/she to the download link when the jpg was clicked.
As of our latest software release (7/19/2010) you can upload a PDF file from within the email editor and insert it into your email. While editing a block, look for the Document icon (next to the image icon on the left side of the editor). You can store and share up to 5 documents for free or you can purchase MyLibrary Plus to increase your total storage to 50 MB of documents and images.