Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
Chapter12 Cisco IronPortEmail Encryption
Optionally, enable read receipts. If you enable this option, the sender receives a
receipt when recipients open the secure envelope.
Optionally, click Advanced to configure the following settings:
Enter the length of time (in seconds) that a message can be in the encryption
queue before timing out. Once a message times out, the appliance bounces the
message and sends a notification to the sender.
Select an encryption algorithm:
– ARC4. ARC4 is the most common choice, providing strong encryption
with minimal decryption delays for message recipients.
– AES. AES provides stronger encryption but also takes longer to decrypt,
introducing delays for recipients. AES is typically used in government
and banking applications.
Enable or disable the decryption applet. Enabling this option causes the
message attachment to be opened in the browser environment. Disabling this
option causes message attachments to be decrypted at the key server. If you
disable this option, messages may take longer to open, but are not dependent
on the browser environment.
In the Message Settings section, enable or disable Secure Reply All.
Enable or disable Secure Message Forwarding.
Select an HTML notification template. Choose from HTML notifications you
configured in text resources. If you did not configure a template, the system uses
the default template.
The key server uses an HTML or text notification based on the recipient’s
email application. You must configure notifications for both.
Select a text notification template. Choose from text notifications you configured
in text resources. If you did not configure a template, the system uses the default
Enter a subject header for encryption failure notifications. The appliance sends a
notification if the encryption process times out.
Select an encryption failure notification template for the message body. Choose
from an encryption failure notification template you configured in text resources.
If you did not configure a template, the system uses the default template.