Google Message Security for Google Apps Administration Guide - Manual (Page 373)

Message Log Search 373
Sender TLS Description: Specifies whether a message was
processed using transport layer security (TLS). If
TLS is on, this field also specifies whether the TLS
was policy enforced or domain enforced.
For an inbound message, this refers to the
connection between the sender's mail server and the
message security service server. For an outbound
message, this refers to the connection between your
company’s mail server and the message security
service server.
Values:
PE-TLS by domain: Message was processed using
Policy Enforced TLS by domain.
SMTP: Message was sent via SMTP.
TLS: Message was sent via TLS encryption.
For more information, see “Transport Layer Security
(TLS)” on page 295.
Session ID Internal number from a legacy feature in the
message security service. This temporary field is
used for tracking.
Example: ac12781b763384629
Sexually Explicit
score Sexually-explicit spam filter (see “Spam Scores” on
page 403 and “Enable and Adjust Spam Filters” on
page 177).
Field Description and Values