diff --git a/BlacksmithWorkshop/BlacksmithWorkshopBusinessLogic/BusinessLogic/MessageInfoLogic.cs b/BlacksmithWorkshop/BlacksmithWorkshopBusinessLogic/BusinessLogic/MessageInfoLogic.cs
new file mode 100644
index 0000000..4ed90c1
--- /dev/null
+++ b/BlacksmithWorkshop/BlacksmithWorkshopBusinessLogic/BusinessLogic/MessageInfoLogic.cs
@@ -0,0 +1,114 @@
+using BlacksmithWorkshopContracts.BindingModels;
+using BlacksmithWorkshopContracts.BusinessLogicsContracts;
+using BlacksmithWorkshopContracts.SearchModels;
+using BlacksmithWorkshopContracts.StoragesContracts;
+using BlacksmithWorkshopContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopBusinessLogic.BusinessLogic
+{
+	public class MessageInfoLogic : IMessageInfoLogic
+	{
+		private readonly ILogger _logger;
+
+		private readonly IMessageInfoStorage _messageInfoStorage;
+
+		public MessageInfoLogic(ILogger<MessageInfoLogic> logger, IMessageInfoStorage messageInfoStorage)
+		{
+			_logger = logger;
+			_messageInfoStorage = messageInfoStorage;
+		}
+
+		public List<MessageInfoViewModel>? ReadList(MessageInfoSearchModel? model)
+		{
+			_logger.LogInformation("ReadList. SenderName:{SenderName}. MessageId:{MessageId}", model?.SenderName, model?.MessageId);
+
+			//list хранит весь список в случае, если model пришло со значением null на вход метода
+			var list = model == null ? _messageInfoStorage.GetFullList() : _messageInfoStorage.GetFilteredList(model);
+
+			if (list == null)
+			{
+				_logger.LogWarning("ReadList return null list");
+				return null;
+			}
+
+			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
+
+			return list;
+		}
+
+		public bool Create(MessageInfoBindingModel model)
+		{
+			CheckModel(model);
+
+			if (_messageInfoStorage.Insert(model) == null)
+			{
+				_logger.LogWarning("Insert operation failed");
+
+				return false;
+			}
+
+			return true;
+		}
+
+		//проверка входного аргумента для методов Insert, Update и Delete
+		private void CheckModel(MessageInfoBindingModel model, bool withParams = true)
+		{
+			if (model == null)
+			{
+				throw new ArgumentNullException(nameof(model));
+			}
+
+			//так как при удалении передаём как параметр false
+			if (!withParams)
+			{
+				return;
+			}
+
+			if (string.IsNullOrEmpty(model.MessageId))
+			{
+				throw new ArgumentNullException("Некорректный id письма", nameof(model.MessageId));
+			}
+
+			if (string.IsNullOrEmpty(model.SenderName))
+			{
+				throw new ArgumentNullException("Отсутствие заголовка у письма", nameof(model.SenderName));
+			}
+
+			if (string.IsNullOrEmpty(model.Subject))
+			{
+				throw new ArgumentNullException("Отсутствие сути у письма", nameof(model.Subject));
+			}
+
+			if (string.IsNullOrEmpty(model.Body))
+			{
+				throw new ArgumentNullException("Отсутствие тела у письма", nameof(model.Body));
+			}
+
+			if (model.DateDelivery >= DateTime.Now)
+			{
+				throw new ArgumentNullException("Некорректная дата отправки письма", nameof(model.DateDelivery));
+			}
+
+			_logger.LogInformation("Client. SenderName:{SenderName}. Subject:{Subject}. Body:{Body}. DateDelivery:{DateDelivery}. MessageId:{MessageId}.",
+				model.SenderName, model.Subject, model.Body, model.DateDelivery, model.MessageId);
+
+			//для проверка на наличие такого же аккаунта
+			var element = _messageInfoStorage.GetElement(new MessageInfoSearchModel
+			{
+				SenderName = model.SenderName,
+			});
+
+			//если элемент найден и его Id не совпадает с Id переданного объекта
+			if (element != null && element.MessageId.Contains(model.MessageId))
+			{
+				throw new InvalidOperationException("Аккаунт с таким логином уже есть");
+			}
+		}
+	}
+}
diff --git a/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/DataFileSingleton.cs b/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/DataFileSingleton.cs
index d2f352b..356a0b0 100644
--- a/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/DataFileSingleton.cs
+++ b/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/DataFileSingleton.cs
@@ -22,6 +22,8 @@ namespace BlacksmithWorkshopFileImplement
 
 		private readonly string ImplementerFileName = "Implementer.xml";
 
+		private readonly string MessageFileName = "Message.xml";
+
 		public List<WorkPiece> WorkPieces { get; private set; }
 
         public List<Order> Orders { get; private set; }
@@ -32,6 +34,8 @@ namespace BlacksmithWorkshopFileImplement
 
 		public List<Implementer> Implementers { get; private set; }
 
+        public List<MessageInfo> Messages { get; private set; }
+
 		public static DataFileSingleton GetInstance()
         {
             if (instance == null)
@@ -52,6 +56,7 @@ namespace BlacksmithWorkshopFileImplement
 
 		public void SaveImplementers() => SaveData(Implementers, ImplementerFileName, "Implementers", x => x.GetXElement);
 
+        public void SaveMessages() => SaveData(Messages, MessageFileName, "Messages", x => x.GetXElement);
 		private DataFileSingleton()
         {
             WorkPieces = LoadData(WorkPieceFileName, "WorkPiece", x => WorkPiece.Create(x)!)!;
@@ -59,7 +64,8 @@ namespace BlacksmithWorkshopFileImplement
             Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
             Clients = LoadData(ClientFileName, "Client", x => Client.Create(x)!)!;
 			Implementers = LoadData(ImplementerFileName, "Implementer", x => Implementer.Create(x)!)!;
-		}
+		    Messages = LoadData(MessageFileName, "Messages", x => MessageInfo.Create(x)!)!;
+        }
 
         private static List<T>? LoadData<T>(string filename, string xmlNodeName, Func<XElement, T> selectFunction)
         {
diff --git a/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/Implements/MessageInfoStorage.cs b/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/Implements/MessageInfoStorage.cs
new file mode 100644
index 0000000..736881b
--- /dev/null
+++ b/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/Implements/MessageInfoStorage.cs
@@ -0,0 +1,76 @@
+using BlacksmithWorkshopContracts.BindingModels;
+using BlacksmithWorkshopContracts.SearchModels;
+using BlacksmithWorkshopContracts.StoragesContracts;
+using BlacksmithWorkshopContracts.ViewModels;
+using BlacksmithWorkshopFileImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopFileImplement.Implements
+{
+	public class MessageInfoStorage : IMessageInfoStorage
+	{
+		private readonly DataFileSingleton source;
+
+		public MessageInfoStorage()
+		{
+			source = DataFileSingleton.GetInstance();
+		}
+
+		public List<MessageInfoViewModel> GetFullList()
+		{
+			return source.Messages.Select(x => GetViewModel(x)).ToList();
+		}
+
+		public List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model)
+		{
+			if (!model.ClientId.HasValue)
+			{
+				return source.Messages
+					.Select(x => GetViewModel(x))
+					.ToList();
+			}
+
+			return source.Messages
+				.Where(x => x.ClientId == model.ClientId)
+				.Select(x => GetViewModel(x))
+				.ToList();
+		}
+
+		public MessageInfoViewModel? GetElement(MessageInfoSearchModel model)
+		{
+			if (!model.ClientId.HasValue)
+			{
+				return null;
+			}
+
+			return source.Messages.FirstOrDefault(x => (model.ClientId.HasValue && x.ClientId == model.ClientId))?.GetViewModel;
+		}
+
+		public MessageInfoViewModel? Insert(MessageInfoBindingModel model)
+		{
+			model.MessageId = source.Messages.Count > 0 ? Convert.ToString(source.Messages.Count + 1) : "1";
+
+			var newMessage = MessageInfo.Create(model);
+
+			if (newMessage == null)
+			{
+				return null;
+			}
+
+			source.Messages.Add(newMessage);
+			source.SaveOrders();
+
+			return GetViewModel(newMessage);
+		}
+
+		//для загрузки названий и имён в заказ
+		private MessageInfoViewModel GetViewModel(MessageInfo message)
+		{
+			return message.GetViewModel;
+		}
+	}
+}
diff --git a/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/Models/MessageInfo.cs b/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/Models/MessageInfo.cs
new file mode 100644
index 0000000..da2dd96
--- /dev/null
+++ b/BlacksmithWorkshop/BlacksmithWorkshopFileImplement/Models/MessageInfo.cs
@@ -0,0 +1,98 @@
+using BlacksmithWorkshopContracts.BindingModels;
+using BlacksmithWorkshopContracts.ViewModels;
+using BlacksmithWorkshopDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace BlacksmithWorkshopFileImplement.Models
+{
+	public class MessageInfo : IMessageInfoModel
+	{
+		public string MessageId { get; private set; } = string.Empty;
+
+		public int? ClientId { get; private set; }
+
+		public string SenderName { get; private set; } = string.Empty;
+
+		public DateTime DateDelivery { get; private set; } = DateTime.Now;
+
+		public string Subject { get; private set; } = string.Empty;
+
+		public string Body { get; private set; } = string.Empty;
+
+		public static MessageInfo? Create(MessageInfoBindingModel model)
+		{
+			if (model == null)
+			{
+				return null;
+			}
+
+			return new MessageInfo()
+			{
+				MessageId = model.MessageId,
+				ClientId = model.ClientId,
+				SenderName = model.SenderName,
+				Body = model.Body,
+				Subject = model.Subject,
+				DateDelivery = model.DateDelivery
+			};
+		}
+
+		public static MessageInfo? Create(XElement element)
+		{
+			if (element == null)
+			{
+				return null;
+			}
+
+			return new MessageInfo()
+			{
+				MessageId = element.Element("MessageId")!.Value,
+				ClientId = Convert.ToInt32(element.Attribute("ClientId")!.Value),
+				SenderName = element.Element("SenderName")!.Value,
+				Body = element.Element("Body")!.Value,
+				Subject = element.Element("Subject")!.Value,
+				DateDelivery = Convert.ToDateTime(element.Element("DateDelivery")!.Value)
+			};
+		}
+
+		public void Update(MessageInfoBindingModel model)
+		{
+			if (model == null)
+			{
+				return;
+			}
+
+			MessageId = model.MessageId;
+			ClientId = model.ClientId;
+			SenderName = model.SenderName;
+			Body = model.Body;
+			Subject = model.Subject;
+			DateDelivery = model.DateDelivery;
+		}
+
+		public MessageInfoViewModel GetViewModel => new()
+		{
+			MessageId = MessageId,
+			ClientId = ClientId,
+			SenderName = SenderName,
+			Body = Body,
+			Subject = Subject,
+			DateDelivery = DateDelivery
+		};
+
+		public XElement GetXElement => new("MessageInfo",
+			new XAttribute("MessageId", MessageId),
+			new XElement("ClientId", ClientId.ToString()),
+			new XElement("SenderName", SenderName),
+			new XElement("Body", Body),
+			new XElement("Subject", Subject),
+			new XElement("DateDelivery", DateDelivery.ToString()),
+	}
+}
diff --git a/BlacksmithWorkshop/BlacksmithWorkshopListImplement/DataListSingleton.cs b/BlacksmithWorkshop/BlacksmithWorkshopListImplement/DataListSingleton.cs
index 6185596..625de76 100644
--- a/BlacksmithWorkshop/BlacksmithWorkshopListImplement/DataListSingleton.cs
+++ b/BlacksmithWorkshop/BlacksmithWorkshopListImplement/DataListSingleton.cs
@@ -27,6 +27,10 @@ namespace BlacksmithWorkshopListImplement
 		//список для хранения исполнителей
 		public List<Implementer> Implementers { get; set; }
 
+		//список для хранения писем
+		public List<MessageInfo> MessageInfos { get; set; }
+
+
 		public DataListSingleton()
         {
             WorkPieces = new List<WorkPiece>();
@@ -34,6 +38,7 @@ namespace BlacksmithWorkshopListImplement
             Orders = new List<Order>();
             Clients = new List<Client>();
             Implementers = new List<Implementer>();
+            MessageInfos = new List<MessageInfo>();
         }
 
         public static DataListSingleton GetInstance()
diff --git a/BlacksmithWorkshop/BlacksmithWorkshopListImplement/Implements/MessageInfoStorage.cs b/BlacksmithWorkshop/BlacksmithWorkshopListImplement/Implements/MessageInfoStorage.cs
new file mode 100644
index 0000000..dce712f
--- /dev/null
+++ b/BlacksmithWorkshop/BlacksmithWorkshopListImplement/Implements/MessageInfoStorage.cs
@@ -0,0 +1,88 @@
+using BlacksmithWorkshopContracts.BindingModels;
+using BlacksmithWorkshopContracts.SearchModels;
+using BlacksmithWorkshopContracts.StoragesContracts;
+using BlacksmithWorkshopContracts.ViewModels;
+using BlacksmithWorkshopListImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopListImplement.Implements
+{
+	public class MessageInfoStorage : IMessageInfoStorage
+	{
+		//поле для работы со списком изделий
+		private readonly DataListSingleton _source;
+
+		public MessageInfoStorage()
+		{
+			_source = DataListSingleton.GetInstance();
+		}
+
+		public List<MessageInfoViewModel> GetFullList()
+		{
+			var result = new List<MessageInfoViewModel>();
+
+			foreach (var messageInfo in _source.MessageInfos)
+			{
+				result.Add(messageInfo.GetViewModel);
+			}
+
+			return result;
+		}
+
+		public List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model)
+		{
+			var result = new List<MessageInfoViewModel>();
+
+			if (string.IsNullOrEmpty(model.MessageId))
+			{
+				return result;
+			}
+
+			foreach (var messageInfo in _source.MessageInfos)
+			{
+				if (messageInfo.ClientId == model.ClientId)
+				{
+					result.Add(messageInfo.GetViewModel);
+				}
+			}
+
+			return result;
+		}
+
+		public MessageInfoViewModel? GetElement(MessageInfoSearchModel model)
+		{
+			if (string.IsNullOrEmpty(model.MessageId))
+			{
+				return null;
+			}
+
+			foreach (var messageInfo in _source.MessageInfos)
+			{
+				if (messageInfo.MessageId == model.MessageId)
+				{
+					return messageInfo.GetViewModel;
+				}
+			}
+
+			return null;
+		}
+
+		public MessageInfoViewModel? Insert(MessageInfoBindingModel model)
+		{
+			var newMessage = MessageInfo.Create(model);
+
+			if (newMessage == null)
+			{
+				return null;
+			}
+
+			_source.MessageInfos.Add(newMessage);
+
+			return newMessage.GetViewModel;
+		}
+	}
+}
diff --git a/BlacksmithWorkshop/BlacksmithWorkshopListImplement/Models/MessageInfo.cs b/BlacksmithWorkshop/BlacksmithWorkshopListImplement/Models/MessageInfo.cs
new file mode 100644
index 0000000..cfcc629
--- /dev/null
+++ b/BlacksmithWorkshop/BlacksmithWorkshopListImplement/Models/MessageInfo.cs
@@ -0,0 +1,73 @@
+using BlacksmithWorkshopContracts.BindingModels;
+using BlacksmithWorkshopContracts.ViewModels;
+using BlacksmithWorkshopDataModels.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BlacksmithWorkshopListImplement.Models
+{
+	public class MessageInfo : IMessageInfoModel
+	{
+		public string MessageId { get; private set; } = string.Empty;
+
+		public int? ClientId { get; private set; }
+
+		public string SenderName { get; private set; } = string.Empty;
+
+		public DateTime DateDelivery { get; private set; } = DateTime.Now;
+
+		public string Subject { get; private set; } = string.Empty;
+
+		public string Body { get; private set; } = string.Empty;
+
+		//метод для создания объекта от класса-компонента на основе класса-BindingModel
+		public static MessageInfo? Create(MessageInfoBindingModel? model)
+		{
+			if (model == null)
+			{
+				return null;
+			}
+
+			return new MessageInfo()
+			{
+				MessageId = model.MessageId,
+				ClientId = model.ClientId,
+				SenderName = model.SenderName,
+				DateDelivery = model.DateDelivery,
+				Subject = model.Subject,
+				Body = model.Body
+			};
+		}
+
+		//метод изменения существующего объекта
+		public void Update(MessageInfoBindingModel? model)
+		{
+			if (model == null)
+			{
+				return;
+			}
+
+			MessageId = model.MessageId;
+			ClientId = model.ClientId;
+			SenderName = model.SenderName;
+			DateDelivery = model.DateDelivery;
+			Subject = model.Subject;
+			Body = model.Body;
+		}
+
+		//метод для создания объекта класса ViewModel на основе данных объекта класса-компонента
+		public MessageInfoViewModel GetViewModel => new()
+		{
+			MessageId = MessageId,
+			ClientId = ClientId,
+			SenderName = SenderName,
+			DateDelivery = DateDelivery,
+			Subject = Subject,
+			Body = Body
+		};
+	}
+}