How can I see who has viewed an Announcement?
To see who has seen an announcement, go to the Announcements tab on the right side of the groups browser.
Click on the overview bar, or choose "Open report" from the drop down on the right to see a list of all of your members and when or if they have viewed the announcement. This will show the date they viewed the announcement, whether it was by logging in to Unison or by opening the email notification.
You will also be able to see if any of the emails bounced, meaning they were not delivered to the recipient.