Google Message Archiving Administration Guide - Manual (Page 28)

Introduction 29
How Outbound Messages Are Archived
Note: Outbound messages are archived only if you enable and configure the
Outbound service for your message security service. For details about setting up
the Outbound services, see the Outbound Services Configuration Guide.
After your message security service processes an outbound message and
determines that it adheres to your corporate policies, Message Archiving archives
the message for the sender if the sender belongs to a user org for which archiving
is turned on, and if the message is delivered to at least one recipient mail host.
Quarantined Outbound Messages
If your message security service determines that an outbound message does not
adhere to corporate policies and places it in the outbound quarantine, Message
Archiving archives the messages only if an administrator either views the
message or delivers it.
Bounced Outbound Messages
When a receiving server bounces an outbound message—for example, if it was
sent to an invalid address—Message Archiving stores both the bounced message
and the original message. Because both messages are stored, a record of the
attempted delivery can be retrieved from the archive if necessary.
Encrypted Outbound Messages
If your email server encrypts outgoing messages using TLS (Transport-Layer
Security), Message Archiving accepts the encrypted messages.
Duplicate Message Handling for Outbound Message
If a user sends an outgoing message to multiple recipients, Message Archiving
stores a single copy of the message.