When you belong to a group with external access, use the email addresses of users you
want to invite from outside your community to participate.
To invite external contributors to join an external group:
Go to the group's main page.
In the Actions list, click Invite people to join this group.
Enter the email addresses of people you want to invite. To invite several
people from your email address book, you can export a comma-, space-, or
semicolon-separated list of addresses from the email application and paste them
Edit the message you want potential group members to see with their