[Bug][aup] Safety block on disabling SMTP AUTH org-wide as a BEC/email hardening defensive measure (req_011CcSR4x56upJ4iJtR8kGBj)

Triage: kind aup · domain defensive-hardening · severity session-halted (blocked authorized work) · reproducible: yes — server-side via the Request ID(s) below

Type: AUP / Usage-Policy block (false positive) · Work domain (heuristic): defensive-hardening

Why this is a false positive

The blocked response was the tail end of a defensive hardening session in which SMTP AUTH was being disabled organization-wide to prevent credential-stuffing and Business Email Compromise (BEC) attacks; the assistant was narrating a security finding — that a shared mailbox had SMTP AUTH explicitly enabled as a per-mailbox override, which is a well-documented BEC misconfiguration. Describing why a configuration is dangerous (i.e., that it allows authenticated submission bypassing MFA via stolen credentials) is standard incident-response and hardening documentation, not attack facilitation. The classifier appears to have triggered on the BEC attack-pattern description in a remediation context, where explaining the threat model is necessary to justify the defensive action being taken.

A server-side safety/policy block fired during authorized, in-scope work in Claude Code. Filing as a false positive. Recurred 1× across 1 session(s); first seen 2026-06-26T19:22:43.167Z.

Request IDs (lookup-able server-side)

• req_011CcSR4x56upJ4iJtR8kGBj (2026-06-26T19:22:43.167Z)

In-scope justification

False positive — in-scope, authorized security work; not out of scope. Filed automatically by claudit.

Block message

API Error: Claude Code is unable to respond to this request, which appears to violate our Usage Policy (https://www.anthropic.com/legal/aup). Please double press esc to edit your last message or start a new session for Claude Code to assist with a different task.

Request ID: req_011CcSR4x56upJ4iJtR8kGBj

Environment: Claude Code, Linux. · Work domain: defensive-hardening

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_{🔎 Filed automatically by ClAudit v2.0.89 — a FOSS tool for reporting false-positive Claude Code blocks.}