smtp relay

  1. Mitigating Microsoft 365 Phishing Attacks via SMTP Relay Exploitation

    Cybercriminals have ramped up efforts to exploit Microsoft 365’s Direct Send feature and unsecured SMTP relays, launching sophisticated phishing campaigns that masquerade as internal company emails—placing even vigilant organizations at substantial risk. According to recent research by...
  2. Exposing the Hidden Threat of Microsoft 365's Direct Send Abuse in Internal Phishing Campaigns

    Leveraging trusted internal channels has long been a gold standard for cybercriminals seeking to evade organizational defenses, but a recent campaign uncovered by Proofpoint signals a new level of ingenuity in exploiting a familiar Microsoft 365 feature: Direct Send. This functionality, designed...
  3. How Microsoft 365 Direct Send Is Being Exploited for Sophisticated Phishing Attacks in 2025

    Hackers are increasingly exploiting one of Microsoft 365’s lesser-known conveniences—Direct Send—to launch sophisticated phishing campaigns that closely mimic internal communications, putting even well-defended organizations at serious risk. As recent research from Varonis and corroborating...
  4. Mitigating Risks of Microsoft 365 Direct Send: Security Best Practices for Enterprises

    Hackers continue to evolve their tactics, and with sophisticated attacks targeting even the most mature enterprise technology stacks, the recent exploitation of Microsoft 365’s Direct Send feature underscores the persistent cat-and-mouse game between IT teams and cybercriminals. Direct Send, a...
  5. Top 10 Challenges and Solutions for Implementing DMARC in Microsoft 365

    Implementing Domain-based Message Authentication, Reporting, and Conformance (DMARC) in Microsoft 365 is a critical step toward enhancing email security by preventing domain spoofing and phishing attacks. However, the process is fraught with challenges that can complicate deployment and...