Supply Chain Security

How Compromised Accounts Bypass Email Security

September 25, 2026 / in Blog / by Zafar Khan, RPost CEO

When the Attacker Looks Like a Trusted User.

Most email security is built around the premise - is this message safe to let into the organization's perimeter?” But today’s account takeover attacks are creating harder problems. For instance, what happens when the attacker is not sending from a suspicious domain, spoofing an executive, or attaching obvious malware? Or what happens when the attacker is already inside a legitimate email account?