You can go into your Seller Admin > View/Edit Affiliates, then on the page that pops up, click the Download List button near the top to save it to a file on your computer. You should be able to open that file in a spreadsheet program like Excel, select the column of emails and copy that into Notepad, from where you can paste it into your email program (you may need to change the line-by-line list into a comma-separated list first, depending on how your emailer works).
