Fake E-Mail not deliverable Messages Exchange

Hey Guys Question for the Community. We have discovered a flood of e-mails with incredibly well made but fake Exchange Delivery Reports. They even made fake message ID's and all domain specific attributes. Then they sent them from a random (external) E-Mail address to a few dozen addresses. What worries me about them, that there is no attachment / malicious link. So nothing you could infect someone with. Sender and recipient is always the mail-address who got the message. Has …

cybersecurity e-mail exchange fake mail messages