User Guide

Contents
xiv
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Troubleshooting Data Loss Prevention 17-42
Enterprise Manager Disconnects the Email Security Appliance 17-42
RSA Email DLP Fails to Detect Violations in Email Attachments 17-43
CHAPTER 18 Cisco Email Encryption 18-1
Overview of Cisco Email Encryption 18-1
How to Encrypt Messages with a Local Key Server 18-2
Encryption Workflow 18-2
Encrypting Messages using the Email Security Appliance 18-4
Enabling Message Encryption on the Email Security Appliance 18-4
Configuring How a Key Service Handles Encrypted Messages 18-4
Configuring the Default Locale of the Envelope 18-7
Updating to the Latest Version of the PXE Engine 18-8
Determining Which Messages to Encrypt 18-8
Using a TLS Connection as an Alternative to Encryption 18-9
Encrypting and Immediately Delivering Messages using a Content Filter 18-9
Encrypting a Message upon Delivery using a Content Filter 18-10
Inserting Encryption Headers into Messages 18-11
Encryption Headers 18-12
Encryption Headers Examples 18-14
CHAPTER 19 S/MIME Security Services 19-1
Overview of S/MIME Security Services 19-1
S/MIME Security Services in Email Security Appliance 19-1
Understanding How S/MIME Security Services Works 19-2
Signing, Encrypting, or Signing and Encrypting Outgoing Messages using S/MIME 19-4
S/MIME Signing and Encryption Workflow in Email Security Appliance 19-4
How to Sign, Encrypt, or Sign and Encrypt Outgoing Messages using S/MIME 19-6
Setting Up Certificates for S/MIME Signing 19-6
Setting Up Public Keys for S/MIME Encryption 19-9
Managing S/MIME Sending Profiles 19-10
Determining Which Messages to Sign, Encrypt, or Sign and Encrypt 19-13
Signing, Encrypting, or Signing and Encrypting and Immediately Delivering Messages using a Content
Filter
19-13
Signing, Encrypting, or Signing and Encrypting a Message upon Delivery using a Content Filter 19-14
Verifying, Decrypting, or Decrypting and Verifying Incoming Messages using S/MIME 19-14
S/MIME Verification and Decryption Workflow in Email Security Appliance 19-15
How to Verify, Decrypt, or Decrypt and Verify Incoming Messages Using S/MIME 19-16
Setting Up Certificates for Decrypting Messages 19-16