Bulk Complaint Level threshold is between 4 and 6.

Why This Matters

A poorly configured Bulk Complaint Level threshold can allow high volumes of unwanted bulk email to reach users, impacting productivity and increasing the risk of phishing or spam. Admin control over this threshold is critical for filtering out abusive senders while avoiding false positives on legitimate marketing emails. Setting it too high or too low compromises your organization's email security posture.

What Aether365 Checks

This check verifies that the Bulk Complaint Level (BCL) threshold for your Microsoft 365 anti-spam policy is set between 4 and 6, which is the recommended range to balance spam filtering and legitimate email delivery. It appears in the Aether365 dashboard under microsoft-365 checks and triggers an alert if the value falls outside this range.