Verdict thresholds: reject, quarantine, tag and pass

MxGuard turns a numeric spam score into one of four actions using fixed default thresholds. Knowing them helps you interpret what happened to any given message.

• Score ≥ 0.97 — Reject. The message is refused at SMTP time with a 550 response. The sender's server gets a bounce; nothing is stored on our side.
• Score 0.85–0.97 — Quarantine. The message is held for 30 days (configurable) and appears in your quarantine and daily digest, where you can release or delete it.
• Score 0.50–0.85 — Tag. The message is delivered to the recipient, optionally with a [SPAM] subject tag if you have enabled tag mode.
• Score < 0.50 — Pass. Delivered normally.

Messages in the uncertain band (roughly 0.50–0.95) are additionally sent to Claude for a second opinion before the final action is chosen. Every domain can override these thresholds — see the article on per-domain scoring thresholds.