...
...the table can be permissioned as appropriate (probably fine to restrict it to admin). Might be nice to restrict the u_email field to be unique, but that's just icing since it's enforceable manually by any reasonable admin.
== Configuring ==
The mail alias binding to groups happens at the Group level in Adminstration controls. Click a group, and then bottom of the dialogue page contains a tab called "Group Email Alias".
To configure a new alias, we need to open a ticket to YSS Client Accounts and make a request to bounce the mail to servicenow@yale.edu