I would like to know if Messaging Gateway is affected by CVE-2023-51764, CVE-2023-51765, CVE-2023-51766.
SMG is NOT Vulnerable to the SMTP smuggling issue as described in CVE-2023-51764, CVE-2023-51765, CVE-2023-51766.
Phishing prevention best practices for Messaging Gateway
Sender Authentication in Symantec Messaging Gateway (Video)