diff --git a/src/daemon/mail_notify.py b/src/daemon/mail_notify.py
index 092fbff..683a0fc 100644
--- a/src/daemon/mail_notify.py
+++ b/src/daemon/mail_notify.py
@@ -6,7 +6,7 @@ import json
 import logging
 from datetime import datetime
 from pathlib import Path
-from typing import Callable, Dict, Optional
+from typing import Dict, Optional
 
 from src.blackboard.models import Task
 from src.blackboard.operations import Blackboard
@@ -32,7 +32,8 @@ def _fmt_retry_info(reason: str, detail: dict) -> str:
         "agent_failed", "compact_failed",
     }
     if reason in _NO_RETRY_REASONS:
-        return f"无法重试（{_REASON_MAP.get(reason, _REASON_MAP[\"_default\"])[0]}）"
+        reason_human = _REASON_MAP.get(reason, _REASON_MAP.get("_default", ("未知原因", lambda d: "")))[0]
+        return f"无法重试（{reason_human}）"
 
     count = (detail or {}).get("count", 0)
     fallback_count = (detail or {}).get("fallback_count", 0)
@@ -51,17 +52,26 @@ _REASON_MAP: Dict[str, tuple] = {
     "max_crash_count": ("连续崩溃达上限", lambda d: f"崩溃 {d.get('count', '?')} 次"),
     "max_retries": ("续杯耗尽（已自动重试）", lambda d: f"重试 {d.get('count', '?')} 次"),
     "max_api_retry_count": ("API 连续失败达上限", lambda d: f"API 重试 {d.get('count', '?')} 次"),
-    "max_monitor_timeouts": ("处理超时达上限", lambda d: f"超时 {d.get('count', '?')} 次，共约 {d.get('elapsed_seconds', 0) // 60} 分钟"),
+    "max_monitor_timeouts": (
+        "处理超时达上限",
+        lambda d: f"超时 {d.get('count', '?')} 次，"
+                  f"共约 {d.get('elapsed_seconds', 0) // 60} 分钟"),
     "gateway_timeout": ("Agent 执行超时（已续杯重试）", lambda d: ""),
     "session_stuck": ("会话假死（lock PID 死亡）", lambda d: f"假死 {d.get('stuck_count', '?')} 次"),
     "revive_failed": ("会话恢复失败", lambda d: f"假死 {d.get('stuck_count', '?')} 次"),
     "auth_failed": ("Agent 认证失败（配置问题）", lambda d: f"stderr: {_extract_stderr(d)}" if _extract_stderr(d) else ""),
-    "fallback_exhausted": ("主模型和备用模型均失败", lambda d: f"fallback {d.get('fallback_count', '?')} 次，原因: {d.get('fallback_reason', '未知')}"),
+    "fallback_exhausted": (
+        "主模型和备用模型均失败",
+        lambda d: f"fallback {d.get('fallback_count', '?')} 次，"
+                  f"原因: {d.get('fallback_reason', '未知')}"),
     "agent_failed": ("收件人主动标记失败", lambda d: ""),
     "compact_failed": ("上下文压缩失败", lambda d: f"stderr: {_extract_stderr(d)}" if _extract_stderr(d) else ""),
     "compact_hanging": ("上下文压缩长时间未完成", lambda d: ""),
     "compact_interrupted": ("上下文压缩被中断（已自动重试）", lambda d: ""),
-    "gateway_unreachable": ("Gateway 不可达（已自动重试）", lambda d: f"stderr: {_extract_stderr(d)}" if _extract_stderr(d) else ""),
+    "gateway_unreachable": (
+        "Gateway 不可达（已自动重试）",
+        lambda d: f"stderr: {_extract_stderr(d)}"
+                  if _extract_stderr(d) else ""),
     "lock_conflict": ("会话锁冲突（已自动重试）", lambda d: ""),
     "max_retry_count": ("重试耗尽", lambda d: f"重试 {d.get('count', '?')} 次"),
     "max_lock_retry_count": ("锁冲突重试耗尽", lambda d: f"重试 {d.get('count', '?')} 次"),
diff --git a/tests/unit/test_classify_outcome.py b/tests/unit/test_classify_outcome.py
index 07f21d8..62a2061 100644
--- a/tests/unit/test_classify_outcome.py
+++ b/tests/unit/test_classify_outcome.py
@@ -165,14 +165,16 @@ class TestClassifyErrorApi:
             1, {"status": "error"}, "rate_limit exceeded", None
         )
         assert result["outcome"] == "api_error"
-        assert result["should_retry"] is False
+        assert result["should_retry"] is True
+        assert result["cooldown_seconds"] == 60
 
     def test_stderr_500(self):
         result = Spawner._classify_outcome(
             1, {"status": "error"}, "HTTP 500 Internal Server Error", None
         )
         assert result["outcome"] == "api_error"
-        assert result["should_retry"] is False
+        assert result["should_retry"] is True
+        assert result["cooldown_seconds"] == 60
 
 
 class TestClassifyErrorCompact: