You can import an existing domain key. If you do not have a domain key, you must first generate your own private RSA key, using OpenSSL or another program. An RSA key pair includes a public key and a private key. The private key is used for creating a signature that accompanies a message. The public key is used for reading the signature to validate the message. When you import a domain key, Symantec Messaging Gateway generates a public key based on the private key you imported.
To import a domain key, you need to have the domain key stored in a text file that you can access from your Control Center.
Instead of importing a domain key, you can add a domain key. When you add a domain key, Symantec Messaging Gateway generates both the private and public RDA keys for you.
The domain key you import must be in PEM format. If the domain key is not in PEM format, or is not acceptable to OpenSSL, Symantec Messaging Gateway will attempt to convert the domain key to correct the issue.