功能添加

Service/EmailBackgroundService.cs

@@ -195,7 +195,7 @@ public class EmailBackgroundService(
                                     message.Subject,
                                     message.Date.DateTime,
                                     message.TextBody ?? message.HtmlBody ?? string.Empty
-                                ))
+                                ) || (DateTime.Now - message.Date.DateTime > TimeSpan.FromDays(3)))
                             {
                                 #if DEBUG
                                 logger.LogDebug("DEBUG 模式下，跳过标记已读步骤");