A distribution group can be used when you want to send email to a group of people without having to type each individual recipient's name. They also provide a way for you to automatically forward email to multiple email addresses. These lists are best suited when emailing Caltech recipients.
If you are a group owner, you can manage the membership and ownership of a group from Outlook Web App settings. You can also manage additional settings for the group.
Click here for instructions on how to manage distribution groups.