User Guide

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AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 18 Cisco Email Encryption
Inserting Encryption Headers into Messages
Procedure
Step 1 Go to Mail Policies > Outgoing Content Filters or Incoming Content Filters.
Step 2 In the Filters section, click Add Filter.
Step 3 In the Actions section, click Add Action and select Add/Edit Header to insert an encryption header
into the messages to specify an additional encryption setting.
For example, if you want a Registered Envelope to expire in 24 hours after you send it, type
X-PostX-ExpirationDate as the header name and +24:00:00 as the header value.
Related Topics
• Encryption Headers, page 18-12
• Encryption Headers Examples, page 18-14
• For more information about creating an encryption content filter, see Encrypting and Immediately
Delivering Messages using a Content Filter, page 18-9.
• For information about inserting a header using a message filter, see Using Message Filters to
Enforce Email Policies.
Encryption Headers
Table 18-3 displays the encryption headers that you can add to messages.
Table 18-3 Email Encryption Headers
MIME Header Description Value
X-PostX-Reply-Enabled
Indicates whether to enable secure reply
for the message and displays the Reply
button in the message bar. This header
adds an encryption setting to the
message.
A Boolean for whether to
display the Reply button. Set
to
true to display the button.
The default value is
false.
X-PostX-Reply-All-Enabled
Indicates whether to enable secure “reply
all” for the message and displays the
Reply All button in the message bar. This
header overrides the default profile
setting.
A Boolean for whether to
display Reply All button.
Set to
true to display the
button. The default value is
false.
X-PostX-Forward-Enabled
Indicates whether to enable secure
message forwarding and displays the
Forward button in the message bar. This
header overrides the default profile
setting.
A Boolean for whether to
display the Forward button.
Set to
true to display the
button. The default value is
false.
X-PostX-Send-Return-Recei
pt
Indicates whether to enable read receipts.
The sender receives a receipt when
recipients open the Secure Envelope.
This header overrides the default profile
setting.
A Boolean for whether to
send a read receipt. Set to
true to display the button.
The default value is
false.