аа понятно, теперь работает

Confectionery/ConfectioneryContracts/BindingModels/MessageInfoBindingModel.cs

@@ -1,4 +1,5 @@
-using System;
+using ConfectioneryDataModels.Models;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -6,7 +7,7 @@ using System.Threading.Tasks;
 
 namespace ConfectioneryContracts.BindingModels
 {
-	public class MessageInfoBindingModel
+	public class MessageInfoBindingModel : IMessageInfoModel
 	{
 		public string MessageId { get; set; } = string.Empty;
 		public int? ClientId { get; set; }

Confectionery/ConfectioneryDatabaseImplement/ConfectioneryDatabase.cs

@@ -15,7 +15,7 @@ namespace ConfectioneryDatabaseImplement
         {
             if (optionsBuilder.IsConfigured == false)
             {
-                optionsBuilder.UseSqlServer(@"Data Source=localhost\SQLEXPRESS;Initial Catalog=ConfectioneryDatabaseNewMailDB;Integrated Security=True;MultipleActiveResultSets=True;;TrustServerCertificate=True");
+                optionsBuilder.UseSqlServer(@"Data Source=localhost\SQLEXPRESS;Initial Catalog=ConfectioneryDatabase7New;Integrated Security=True;MultipleActiveResultSets=True;;TrustServerCertificate=True");
             }
             base.OnConfiguring(optionsBuilder);
         }

Confectionery/ConfectioneryDatabaseImplement/Migrations/20240602085942_InitialMail.cs

@@ -1,22 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-namespace ConfectioneryDatabaseImplement.Migrations
-{
-    /// <inheritdoc />
-    public partial class InitialMail : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-
-        }
-    }
-}

Confectionery/ConfectioneryDatabaseImplement/Migrations/20240602112944_InitialMail.Designer.cs

@@ -12,7 +12,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 namespace ConfectioneryDatabaseImplement.Migrations
 {
     [DbContext(typeof(ConfectioneryDatabase))]
-    [Migration("20240602085942_InitialMail")]
+    [Migration("20240602112944_InitialMail")]
     partial class InitialMail
     {
         /// <inheritdoc />

Confectionery/ConfectioneryDatabaseImplement/Migrations/20240602112944_InitialMail.cs

@@ -0,0 +1,47 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ConfectioneryDatabaseImplement.Migrations
+{
+    /// <inheritdoc />
+    public partial class InitialMail : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+			migrationBuilder.CreateTable(
+				name: "MessageInfos",
+				columns: table => new
+				{
+					MessageId = table.Column<string>(type: "nvarchar(450)", nullable: false),
+					ClientId = table.Column<int>(type: "int", nullable: true),
+					SenderName = table.Column<string>(type: "nvarchar(max)", nullable: false),
+					DateDelivery = table.Column<DateTime>(type: "datetime2", nullable: false),
+					Subject = table.Column<string>(type: "nvarchar(max)", nullable: false),
+					Body = table.Column<string>(type: "nvarchar(max)", nullable: false)
+				},
+				constraints: table =>
+				{
+					table.PrimaryKey("PK_MessageInfos", x => x.MessageId);
+					table.ForeignKey(
+						name: "FK_MessageInfos_Clients_ClientId",
+						column: x => x.ClientId,
+						principalTable: "Clients",
+						principalColumn: "Id");
+				});
+
+			migrationBuilder.CreateIndex(
+				name: "IX_MessageInfos_ClientId",
+				table: "MessageInfos",
+				column: "ClientId");
+		}
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+			migrationBuilder.DropTable(
+				name: "MessageInfos");
+		}
+    }
+}

Confectionery/ConfectioneryRestApi/Controllers/ClientController.cs

@@ -3,6 +3,7 @@ using ConfectioneryContracts.BusinessLogicsContracts;
 using ConfectioneryContracts.SearchModels;
 using ConfectioneryContracts.ViewModels;
 using Microsoft.AspNetCore.Mvc;
+using System.Net;
 
 namespace ConfectioneryRestApi.Controllers
 {
@@ -47,7 +48,7 @@ namespace ConfectioneryRestApi.Controllers
             catch (Exception ex)
             {
                 _logger.LogError(ex, "Ошибка регистрации");
-                throw;
+				Response.StatusCode = (int)HttpStatusCode.NotAcceptable;
 			}
         }
         [HttpPost]

Confectionery/ConfectioneryRestApi/appsettings.json

@@ -11,5 +11,5 @@
   "PopHost": "pop.gmail.com",
   "PopPort": "995",
   "MailLogin": "labworkalimova@gmail.com",
-  "MailPassword": "labworkalimova1!"
+  "MailPassword": "mrwi jpal mwmk gwgl"
 }

Confectionery/ConfectioneryView/App.config

@@ -6,6 +6,6 @@
 		<add key="PopHost" value="pop.gmail.com" />
 		<add key="PopPort" value="995" />
 		<add key="MailLogin" value="labworkalimova@gmail.com" />
-		<add key="MailPassword" value="labworkalimova1!" />
+		<add key="MailPassword" value="mrwi jpal mwmk gwgl" />
 	</appSettings>
 </configuration>