1. When you are logged into the webmail portal, click the Addresses link on the top of the page.

2. Scroll down to the bottom of your address list and choose the Export to CSV File option.

3. This will download the file to your computer.  Check the browser window for signs of the download or go to your download folder to find the <email>-addresses.csv file. This file can be opened with a spreadsheet program (best option) or Notepad.