True or False: It is recommended to use a Self-Signed Certificate with Strict-Trust Enforced Option for secure delivery.

Using a self-signed certificate with the strict trust enforced option is generally not recommended for secure delivery because self-signed certificates do not rely on third-party certificate authorities (CAs) for validation. This lack of external validation can lead to security challenges, especially in production environments.

When strict trust is enforced, the system is configured to accept only those certificates that are explicitly trusted. This situation creates difficulties because self-signed certificates are not inherently trusted by clients, requiring manual additions to trust stores. In scenarios where secure and seamless communication is crucial, relying on self-signed certificates can introduce vulnerabilities like man-in-the-middle attacks, where attackers could impersonate legitimate servers.

In contrast, using certificates from established and trusted CAs ensures that communication remains secure and that both parties can verify each other's identities automatically without manual intervention. This level of trust is essential for maintaining the integrity and security of email communications within a secure email gateway environment. Thus, the use of self-signed certificates should be limited to specific contexts such as internal networks or testing, where the risk is better managed and the trust model is controlled.