Adds tests/test_integration_send_scan.py: 7 harness-gated cases covering
delivery and Message-ID correlation, scanner ingestion without a delivery
claim, idempotency, resend, suppression, rejected requests never reaching the
provider, and verification mail carrying no authorization.
Fixes the reply heuristic, which matched against headers as well as body. The
Received: trace that every MTA-handled message carries matched its "received"
keyword, so ordinary mail was classified human_reply with a
success.reply_received assessment at medium confidence -- the exact overclaim
this repo exists to prevent. Hand-written fixtures have no Received headers,
so only real scanned mail exposed it. The heuristic now takes the body alone;
DSN detection still sees headers, which it needs. Regression test is offline.
Fixes the provider reference: SMTPProvider set no Message-ID, so send() fell
back to abs(hash((recipient, subject))) -- randomized per process and colliding
for equal recipient/subject. Outgoing mail now carries a proper RFC 5322
Message-ID, returned as the reference, which is what makes send-to-scan
correlation testable.
Suite: 72 passed with the harness up, 62 passed + 10 skipped with it down.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
tegwick
e9609b4024