Internal Address Spoofing using Outlook SMTP Server [migrated]
Is there a way to harden Exchange Online to prevent spoofing of internal addresses using SMTP?
For example, if I connect to Outlook’s SMTP server and issue the following commands:
HELO domain.com
MAIL FROM: ceo@domain.com
RCPT TO: employee… Continue reading Internal Address Spoofing using Outlook SMTP Server [migrated]