Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
Raw-MIME passthrough (STARTTLS, AUTH LOGIN) — separate from the notify HTTP-API alert path (which drops inline CID images). Per-customer token-bucket rate limit, From-header allowlist backstop. Resend key stays hub-side. No new external dep. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>