Advanced email threat detection and response

A secure email gateway filters inbound email at the perimeter. Expel’s email threat detection goes further by monitoring for post-delivery activity to detect things like business email compromise that bypasses filters, investigating user-reported emails, and responding to account takeover once an attacker is inside your environment.

Expel detects BEC by monitoring for compromised email accounts, anomalous send patterns, inbox rules that forward email externally, and impersonation attempts. These are signals secure email gateways and basic spam filters miss. When confirmed, Expel takes action immediately by disabling accounts and notifying your team.

Once an attacker has valid credentials, email gateway filters provide no protection. Expel detects post-authentication account takeover by monitoring for anomalous login patterns, inbox rule creation, bulk email forwarding, and unusual OAuth application grants that indicate an attacker operating inside a legitimate account.

Yes. Expel integrates with Proofpoint, Mimecast, Abnormal Security, and Sublime, maximizing your investment by turning noisy alerts into intel you can act on. We ingest telemetry from your gateway alongside Microsoft 365 or Google Workspace signals, giving our analysts full visibility and context both pre-delivery and post-delivery activity.

Expel correlates email data with signals from identity, endpoint, and cloud tools across your security stack, not just the email gateway. This lets analysts confirm whether a malicious email led to compromise elsewhere, such as an account takeover, and identify every affected user or system.