GlassFrog allows you to email members of your circle by following these steps. The result is a list of email addresses for your circle members each separated by a comma, which is the industry standard.
For Microsoft Outlook users, however, the default email address separator is a semicolon. If you would like to use the GlassFrog email feature, you have two options:
1) Change your Outlook email to allow the use a comma in addition to a semicolon. We found these instructions that walk you through how to do this for various versions of Outlook.
2) Or, you can use these steps provided above and then edit the resultant email strings to replace the commas with semicolons.