This rule is designed to detect open redirect vulnerabilities associated with the domain 'social.bigpress.net'. Open redirects can be exploited to mislead users into clicking malicious links under the guise of sending them to legitimate sites. The rule functions by analyzing inbound messages for links directed to 'social.bigpress.net', particularly focusing on URLs that contain the path '/emailtrack/click' and query parameters that include 'goto='. It also checks that the 'goto' parameter does not redirect to another bigpress.net domain, which would indicate a potential bypass of the open redirect filter. Furthermore, the rule incorporates email sender validation by ensuring that the root domain of the sender’s email is not highly trusted unless it fails DMARC checks. As a result, this rule helps in the prevention of credential phishing and malware or ransomware delivery through deceptive link redirection, reinforcing overall email security by analyzing both URL structures and sender authenticity.