Cyberdudebivash

        Check Your Logs Now: A Silent Postmark Backdoor is Stealing Your Transactional Emails     By CyberDudeBivash • September 28, 2025, 3:06 AM IST • Threat Intelligence Report   This is a critical alert for every developer and organization that relies on the Postmark transactional email service. A new, stealthy campaign is underway where threat actors are actively compromising corporate servers and developer workstations to steal Postmark API keys. The goal is not to disrupt your email service, but something far more insidious: to create a silent backdoor. Using the stolen keys, attackers are programmatically adding secret BCC addresses and webhook URLs to your Postmark streams, allowing them to receive a hidden copy of every single sensitive transactional email you send—password resets, user invitations, payment receipts, and 2FA links. This is a massive data breach happening right under your nose, leveraging your own trusted infrastr...