In the group site groups can be selected. The selected groups can now be contacted using the email form. In the final step, when the mail text is added and the user has to press submit to send the email, the selected groups should be listed so the user can be sure the mail is sent to the right groups.
Todo: In the "to" field the group names should be listed. It would be best to have a limit. Let's say, it displays the name of max. 5 groups. If there are more groups, it lists the 5 groups and says "... and 128 other groups".