If the -S switch is used, the information is instead extracted from the subscribe request. For lists with moderated subscription, require moderator approval also for unsubscribe requests. Remote admins are normally informed about unsuccessful unsubscribes. This creates problems when there is more than one moderator. Therefore, when the -m switch is used, the notification is suppressed.
Moderators can still determine the result by using the -query command.
Requests to unsubscribe from moderated lists do not require moderator approval. Target addresses will be notified if the are added or removed from the subscriber list. The list-owner is not notified of subscription events. The list-owner is notified about failed unsubscribe attempts. Usually, these are from subscribers that do not remember their subscription address and require administrative assistance.