Cisco Cisco Email Security Appliance C650 Guía Del Usuario
18-10
Cisco AsyncOS 8.5 for Email User Guide
Chapter 18 Email Authentication
Configuring DomainKeys and DKIM Signing
Step 4
Click Generate and select a key size.
Larger key sizes are more secure; however, larger keys can have an impact on performance. Cisco
recommends a key size of 768 bits, which should provide a good balance between security and
performance.
recommends a key size of 768 bits, which should provide a good balance between security and
performance.
Step 5
Submit and commit your changes.
Note
If you have not done so already, you may need to edit your domain profile to assign the key.
Exporting Signing Keys
All keys on the appliance are exported together in a single text file.
Procedure
Step 1
Choose Mail Policies > Signing Keys.
Step 2
Click Export Keys.
Step 3
Enter a name for the file and click Submit.
Importing or Entering Existing Signing Keys
Pasting a Key
Procedure
Step 1
Choose Mail Policies > Signing Keys.
Step 2
Click Add Key.
Step 3
Paste the key into the Paste Key field (must be PEM-formatted and must be RSA keys only).
Step 4
Submit and commit your changes.
Importing Keys from an Existing Export File
Note
To obtain a key file, see
.
Procedure
Step 1
Choose Mail Policies > Signing Keys.
Step 2
Click Import Keys.
Step 3
Select the file that contains the exported signing keys.