We often have question on how to disable user in Domino (access and email). Disable access can be done with Who can access this server setting but there is now way to disable mail receive other than adding readers in their person document record. It would be much easier if there is a new server setting on who cannot receive email.
Not disabling the email receive would mean that their mailbox size will get bigger as they continue to receive notification sent to group. Taking them out of all group mean that we need to take note of their group membership first so that we can restore it when said user is enabled again.