Here's how to get a comma separated email list for a group.
1. Go to MY STUFF -> MY GROUPS in the main navigation bar.
![](/sites/default/files/mygroupsD7.png)
2. Click on the group that you want to generate an email list for.
![](/sites/default/files/qnArchives.png)
3. Click on the Group tab, and then 'Email List'.
![](/sites/default/files/emailList.png)
4. Copy and paste the list that appears into your email message.