diff --git a/src/food-market.domain/Platform/PlatformSettings.cs b/src/food-market.domain/Platform/PlatformSettings.cs
new file mode 100644
index 0000000..966180f
--- /dev/null
+++ b/src/food-market.domain/Platform/PlatformSettings.cs
@@ -0,0 +1,36 @@
+using foodmarket.Domain.Common;
+
+namespace foodmarket.Domain.Platform;
+
+/// <summary>Платформенные настройки (singleton, single-row). Хранят SMTP-креды
+/// для отправки писем (forgot-password, инвайты, нотификации). Не tenant-scoped —
+/// общий конфиг для всей платформы, видны и меняются только Супер-администратором.
+///
+/// SmtpPassword хранится зашифрованным через DataProtection API
+/// (`IDataProtectionProvider.CreateProtector("foodmarket.smtp")`); снаружи
+/// (контроллер) — никогда не возвращается в открытом виде, только has-password флаг.</summary>
+public class PlatformSettings : Entity
+{
+    /// <summary>SMTP-сервер для отправки исходящей почты (НЕ IMAP — IMAP это
+    /// для чтения входящей).</summary>
+    public string? SmtpHost { get; set; }
+    public int? SmtpPort { get; set; }
+
+    /// <summary>Implicit TLS (SMTPS, обычно порт 465). Взаимоисключающий
+    /// со SmtpStartTls (587).</summary>
+    public bool SmtpUseSsl { get; set; }
+
+    /// <summary>STARTTLS upgrade (обычно порт 587). По дефолту true в большинстве
+    /// современных провайдеров (Gmail/Yandex/Mailgun).</summary>
+    public bool SmtpStartTls { get; set; } = true;
+
+    public string? SmtpUsername { get; set; }
+
+    /// <summary>Зашифрованный SmtpPassword (base64 через DataProtection).
+    /// Никогда не отдаётся в API-ответах. Установка только через PUT с
+    /// явно переданным new-password полем.</summary>
+    public string? SmtpPasswordEncrypted { get; set; }
+
+    public string? FromEmail { get; set; }
+    public string? FromName { get; set; }
+}
diff --git a/src/food-market.infrastructure/Persistence/AppDbContext.cs b/src/food-market.infrastructure/Persistence/AppDbContext.cs
index 1397a10..cd8cb2e 100644
--- a/src/food-market.infrastructure/Persistence/AppDbContext.cs
+++ b/src/food-market.infrastructure/Persistence/AppDbContext.cs
@@ -51,6 +51,7 @@ public AppDbContext(DbContextOptions<AppDbContext> options, ITenantContext tenan
     public DbSet<EmployeeRetailPointAssignment> EmployeeRetailPointAssignments => Set<EmployeeRetailPointAssignment>();
     public DbSet<SuperAdminAuditLog> SuperAdminAuditLogs => Set<SuperAdminAuditLog>();
     public DbSet<SystemSettings> SystemSettings => Set<SystemSettings>();
+    public DbSet<foodmarket.Domain.Platform.PlatformSettings> PlatformSettings => Set<foodmarket.Domain.Platform.PlatformSettings>();
 
     protected override void OnModelCreating(ModelBuilder builder)
     {
@@ -86,6 +87,15 @@ protected override void OnModelCreating(ModelBuilder builder)
             b.ToTable("system_settings");
         });
 
+        builder.Entity<foodmarket.Domain.Platform.PlatformSettings>(b =>
+        {
+            b.ToTable("platform_settings");
+            b.Property(x => x.SmtpHost).HasMaxLength(200);
+            b.Property(x => x.SmtpUsername).HasMaxLength(200);
+            b.Property(x => x.FromEmail).HasMaxLength(200);
+            b.Property(x => x.FromName).HasMaxLength(200);
+        });
+
         builder.Entity<SuperAdminAuditLog>(b =>
         {
             b.ToTable("super_admin_audit_log");
diff --git a/src/food-market.infrastructure/Persistence/Migrations/20260506100000_Phase5b_PlatformSettings.cs b/src/food-market.infrastructure/Persistence/Migrations/20260506100000_Phase5b_PlatformSettings.cs
new file mode 100644
index 0000000..a360594
--- /dev/null
+++ b/src/food-market.infrastructure/Persistence/Migrations/20260506100000_Phase5b_PlatformSettings.cs
@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace foodmarket.Infrastructure.Persistence.Migrations
+{
+    /// <summary>Платформенные настройки (singleton). SMTP-креды для отправки
+    /// писем (forgot-password, нотификации). Управляется SuperAdmin'ом через
+    /// /super-admin/platform-settings. Видна только им.</summary>
+    public partial class Phase5b_PlatformSettings : Migration
+    {
+        protected override void Up(MigrationBuilder b)
+        {
+            b.CreateTable(
+                name: "platform_settings",
+                schema: "public",
+                columns: table => new
+                {
+                    Id = table.Column<System.Guid>(type: "uuid", nullable: false),
+                    SmtpHost = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
+                    SmtpPort = table.Column<int>(type: "integer", nullable: true),
+                    SmtpUseSsl = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
+                    SmtpStartTls = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
+                    SmtpUsername = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
+                    SmtpPasswordEncrypted = table.Column<string>(type: "text", nullable: true),
+                    FromEmail = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
+                    FromName = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
+                    CreatedAt = table.Column<System.DateTime>(type: "timestamp with time zone", nullable: false),
+                    UpdatedAt = table.Column<System.DateTime>(type: "timestamp with time zone", nullable: true),
+                },
+                constraints: table => table.PrimaryKey("PK_platform_settings", x => x.Id));
+        }
+
+        protected override void Down(MigrationBuilder b)
+        {
+            b.DropTable(name: "platform_settings", schema: "public");
+        }
+    }
+}