{
  "label_to_id": {
    "auth_failure": 0,
    "domain_blacklisted": 1,
    "geo_blocked": 2,
    "greylisting": 3,
    "invalid_address": 4,
    "ip_blacklisted": 5,
    "mailbox_disabled": 6,
    "mailbox_full": 7,
    "policy_blocked": 8,
    "rate_limited": 9,
    "relay_denied": 10,
    "server_error": 11,
    "spam_blocked": 12,
    "unknown": 13,
    "user_unknown": 14,
    "virus_detected": 15
  },
  "id_to_label": {
    "0": "auth_failure",
    "1": "domain_blacklisted",
    "2": "geo_blocked",
    "3": "greylisting",
    "4": "invalid_address",
    "5": "ip_blacklisted",
    "6": "mailbox_disabled",
    "7": "mailbox_full",
    "8": "policy_blocked",
    "9": "rate_limited",
    "10": "relay_denied",
    "11": "server_error",
    "12": "spam_blocked",
    "13": "unknown",
    "14": "user_unknown",
    "15": "virus_detected"
  }
}