Google Message Security for Google Apps Administration Guide - Manual (Page 153)

Quarantine Summary & Notifications 153
The default setting is Immediately.
Early Detection
Determines whether a user receives a notification when a message is sent to
the Pending Quarantine due to Early Detection Filtering. When this
notification is turned On, users will receive an immediate message every time
a potential threat or high-risk message is sent to the Pending tab in Message
Center.
My First Spam
Determines whether a new user receives notification of the first spam
message quarantined for that account in the Message Center. The notification
is sent regardless of whether the user has logged in to the account. This
ensures that users are aware of the message security services and initial
activity, even if they forget to log in after receiving the Welcome notice.
The default setting is On.
Spam
Determines whether a user receives a periodic Spam notification when at
least one new spam message has been quarantined since the last log-in to
the Message Center (not the Administration Console). The frequency of the
notification is configurable.
The default frequency of the spam notification is seven days. The optimal
notification intervals are between three to seven days. Fewer than every three
days may be considered a nuisance by some users, and more than seven
days may not leave enough notice to review quarantined messages before
the system automatically expires them two weeks from the time of receipt.
The notification day is determined using the user’s UID number, a unique
identifier for the user account, and is therefore not configurable.
The default settings are:
• Notification: On
• Frequency: Every 7 Days
• Quarantine Summary: Selected
Subject Links: On
Delivery Time: 9 pm
Inbox Delivery: Off