This detection rule identifies potential open redirect vulnerabilities associated with the domain 'listing.ca'. Open redirects can allow an attacker to redirect users to malicious sites, which can be abused for credential phishing or distributing malware and ransomware. The rule specifically looks for instances where messages include links that redirect through 'listing.ca' and contain a query parameter 'goto='. Furthermore, it checks to ensure that the 'goto' parameter does not lead back to 'listing.ca' from trusted sender domains that might fail DMARC authentication. This multi-faceted approach ensures the detection of exploitation attempts while reducing false positives from trusted senders who may have legitimate reasons for riskier links.