Google Message Security for Google Apps Administration Guide - Manual (Page 339)

Reports 339
Attachments by Domain (Inbound)
Per domain, the number of messages with attachments, and how those messages
were handled by the system.
Two types of inbound Attachments by Domain reports are available. One report
aggregates all messages for sub-domains and aliased domains to the primary
domain. A second type of report -- the Attachments by Domain (& sub-
domains) report -- includes all sub-domains and domain aliases exactly as they
were received without any mapping to a primary domain. The fields in these two
reports are identical, and each report has the same total emails processed.
..
Field Description
Domain Domain to which messages were sent.
With Attachments Number of messages with attachments passed
through the message service.
Messages Filtered Number of messages with attachments filtered by
the message service.
Quarantined Number of messages with attachments
quarantined.
Bytes Quarantined Total size of quarantined messages with
attachments.
Bounced Number of messages with attachments bounced.
Bytes Bounced Total size of bounced messages with attachments.
Size Number of messages with attachments bounced by
attachment size restrictions.
File Extension Depending upon how you configured your Custom
File Types filter, this item returns the number of
messages with attachments either bounced,
approved, or quarantined. The filtering is based
upon the attachment’s file extension.
System Threat Depending upon how you configured your System
Threat filter, this item returns the number of
messages with attachments either bounced,
approved, or quarantined. The filtering is based
upon the attachment’s file extension.
Productivity Depending upon how you configured your
Productivity filter, this item returns the number of
messages with attachments either bounced,
approved, or quarantined. The filtering is based
upon the attachment’s file extension.
% of Traffic Percent of messages with attachments filtered in
overall inbound traffic flow.