Add an exclude text box to exclude certain contacts from a list
For email testing, add a text box to exclude certain recipients. Ex: Say you know someone on a test list is out of office. It would be nice to add that email to an exclude list so they won't receive it.
Or, for test deliveries, have a button to open a panel of all the list contacts with a checkbox for each so the user can uncheck (temporarily, just for this delivery) certain names.