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Google Message Security for Google Apps Administration Guide User Manual

Page 306

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306

Message Security for Google Apps Administration Guide

The second outbound TLS setting enables you to choose how the message
security service sends your outbound messages to recipient mail servers. If
you are not sure what to select, choose “Send by SMTP or TLS.”

Send only SMTP: No TLS encryption, and all messages are delivered via
SMTP.

Send by SMTP or TLS (Recommended): This is the recommended
setting. Messages sent via TLS are delivered via TLS to the recipient.
Recipient servers that do not support TLS will receive their mail delivered
via SMTP. All other messages are delivered via SMTP.

Send by TLS if possible: This delivers all messages by TLS when
possible. Recipient servers that do not support TLS will receive their mail
via SMTP.