SMTP Smuggling Technique Bypasses Email Authentications Establishing Legitimacy
A newly-discovered technique misusing SMTP commands allows cybercriminals to pass SPF, DKIM and DMARC checks, empowering impersonated emails to reach their intended victim. Earlier this month, Timo Longin, security researcher with cybersecurity consulting firm SEC Consult published details on what is now referred to as SMTP Smuggling.