In order to encrypt the SMTP conversations with other MTAs that use TLS (both inbound and outbound conversations).Functional Overview and RequirementsĪn administrator wants to create a self-signed certificate on the appliance for any of these reasons: Certificates can be applied at the machine level as well however, if the machine is ever removed from the cluster and then added back, the machine-level certificates are lost. Note: This document describes how to install certificates at the cluster level with the use of the Centralized Management feature on the ESA. Tip: For more information about TLS, refer to RFC 3207. It allows an administrator to import a certificate and private key from a Certificate Authority (CA) service, or use a self-signed certificate.Ĭisco AsyncOS for Email Security supports the STARTTLS extension to Simple Mail Transfer Protocol (SMTP) ( Secure SMTP over TLS). The TLS implementation on the ESA provides privacy for point-to-point transmission of emails through encryption. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. This document describes how to create a certificate for use with TLS, activate inbound / outbound TLS, and troubleshoot issues on the Cisco ESA.
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