Groupwise user can't remove another user from a notification list.
When a GroupWise user tries to add another user to the notification list (Tools > Options > Security > Notify), a third user (User3) is also added but then at some point User3 can no longer be removed from the list. A repair has been done on all 3 mailboxes. The third user (User3) was not provided any proxy access, but still, their name appears several times in the notification list and can't be removed.
On the user with an issue:
1. start gw check
2. mailbox/ library maintenance
3. contents + fix options checked
4. Misc tab
5. Type this string
You can send an email to yourself the results in the "Results" tab.
This will remove the user (User3) from the notification list.