EML files are saved email messages outside of standard Microsoft support conventions.  Still, Office 365  has some limited support to show content but not automatically filter it as part of normal security checking.  The SANS ISC shares a highly educational narrative on this new approach of bypassing automated security checks in O/365 based email. https://isc.sans.edu/forums/diary/EML+attachments+in+O365+a+recipe+for+phishing/25474/ […]