diff --git a/app/Domains/Auth/Models/User.php b/app/Domains/Auth/Models/User.php
index 3dbf641..1826676 100644
--- a/app/Domains/Auth/Models/User.php
+++ b/app/Domains/Auth/Models/User.php
@@ -19,7 +19,7 @@ use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
 
 #[Fillable(['nombre_apellido', 'email', 'password', 'dni', 'telefono', 'google_id', 'rol_codigo', 'tenant_codigo'])]
-#[Hidden(['password', 'remember_token'])]
+#[Hidden(['password', 'remember_token', 'active_email'])]
 class User extends Authenticatable
 {
     /** @use HasFactory<UserFactory> */
diff --git a/app/Domains/Auth/Requests/RegisterUserRequest.php b/app/Domains/Auth/Requests/RegisterUserRequest.php
index 8590fa1..5acfb09 100644
--- a/app/Domains/Auth/Requests/RegisterUserRequest.php
+++ b/app/Domains/Auth/Requests/RegisterUserRequest.php
@@ -21,7 +21,13 @@ class RegisterUserRequest extends FormRequest
         return [
             'tenant_codigo' => ['nullable', 'string', Rule::exists('tenants', 'codigo')],
             'nombre_apellido' => ['required', 'string', 'max:255'],
-            'email' => ['required', 'string', 'email', 'max:255', Rule::unique('users', 'email')],
+            'email' => [
+                'required',
+                'string',
+                'email',
+                'max:255',
+                Rule::unique('users', 'email')->whereNull('deleted_at'),
+            ],
             'password' => ['required', 'string', 'confirmed', Password::min(8)->mixedCase()->symbols()],
             'dni' => ['nullable', 'string', 'max:255'],
             'telefono' => ['nullable', 'string', 'max:255'],
diff --git a/app/Domains/Auth/Requests/UpdateProfileRequest.php b/app/Domains/Auth/Requests/UpdateProfileRequest.php
index dae0ed4..a4984d7 100644
--- a/app/Domains/Auth/Requests/UpdateProfileRequest.php
+++ b/app/Domains/Auth/Requests/UpdateProfileRequest.php
@@ -4,6 +4,7 @@ namespace App\Domains\Auth\Requests;
 
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
+use Illuminate\Validation\Rules\Password;
 
 class UpdateProfileRequest extends FormRequest
 {
@@ -19,11 +20,13 @@ class UpdateProfileRequest extends FormRequest
             'email' => [
                 'required',
                 'email',
-                Rule::unique('users', 'email')->ignore($this->user()->id),
+                Rule::unique('users', 'email')
+                    ->whereNull('deleted_at')
+                    ->ignore($this->user()->id),
             ],
             'dni' => ['nullable', 'string', 'regex:/^[0-9]{7,8}$/'],
             'telefono' => ['nullable', 'string', 'regex:/^\+?[0-9\s\-]+$/'],
-            'password' => ['nullable', 'string', \Illuminate\Validation\Rules\Password::min(8)->mixedCase()->symbols()],
+            'password' => ['nullable', 'string', Password::min(8)->mixedCase()->symbols()],
         ];
     }
 }
diff --git a/app/Domains/Staff/Requests/StoreStaffRequest.php b/app/Domains/Staff/Requests/StoreStaffRequest.php
index 152f923..b592e4a 100644
--- a/app/Domains/Staff/Requests/StoreStaffRequest.php
+++ b/app/Domains/Staff/Requests/StoreStaffRequest.php
@@ -23,7 +23,12 @@ class StoreStaffRequest extends FormRequest
         return [
             'nombre_apellido' => ['required', 'string', 'max:255'],
             'dni' => ['required', 'string', 'max:50'],
-            'email' => ['required', 'email', 'max:255', 'unique:users,email'],
+            'email' => [
+                'required',
+                'email',
+                'max:255',
+                Rule::unique('users', 'email')->whereNull('deleted_at'),
+            ],
             'category_ids' => $categoryRules,
             'category_ids.*' => ['integer', 'distinct', Rule::exists('categorias', 'id')],
         ];
diff --git a/app/Domains/Staff/Requests/UpdateStaffRequest.php b/app/Domains/Staff/Requests/UpdateStaffRequest.php
index cc1b6c4..19e1a94 100644
--- a/app/Domains/Staff/Requests/UpdateStaffRequest.php
+++ b/app/Domains/Staff/Requests/UpdateStaffRequest.php
@@ -28,7 +28,9 @@ class UpdateStaffRequest extends FormRequest
                 'required',
                 'email',
                 'max:255',
-                Rule::unique('users', 'email')->ignore($staffId),
+                Rule::unique('users', 'email')
+                    ->whereNull('deleted_at')
+                    ->ignore($staffId),
             ],
             'category_ids' => $categoryRules,
             'category_ids.*' => ['integer', 'distinct', Rule::exists('categorias', 'id')],
diff --git a/database/migrations/2026_09_03_000100_scope_user_email_unique_to_active_accounts.php b/database/migrations/2026_09_03_000100_scope_user_email_unique_to_active_accounts.php
new file mode 100644
index 0000000..91e0acc
--- /dev/null
+++ b/database/migrations/2026_09_03_000100_scope_user_email_unique_to_active_accounts.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('users', function (Blueprint $table): void {
+            $table->dropUnique(['email']);
+            $table->string('active_email')
+                ->nullable()
+                ->storedAs('CASE WHEN `deleted_at` IS NULL THEN LOWER(`email`) ELSE NULL END');
+            $table->unique('active_email');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table): void {
+            $table->dropUnique(['active_email']);
+            $table->dropColumn('active_email');
+            $table->unique('email');
+        });
+    }
+};
diff --git a/tests/Feature/Staff/StaffControllerTest.php b/tests/Feature/Staff/StaffControllerTest.php
index 50ac709..194cd35 100644
--- a/tests/Feature/Staff/StaffControllerTest.php
+++ b/tests/Feature/Staff/StaffControllerTest.php
@@ -121,6 +121,11 @@ class StaffControllerTest extends TestCase
 
         $this->deleteJson("/api/v1/adminapp/tenant/staff/{$staffId}")->assertNoContent();
         $this->assertSoftDeleted('users', ['id' => $staffId]);
+        $this->assertDatabaseHas('users', [
+            'id' => $staffId,
+            'email' => 'ada@example.test',
+            'active_email' => null,
+        ]);
         $this->assertDatabaseMissing('personal_access_tokens', ['id' => $accessTokenId]);
         $this->assertDatabaseHas('category_scanners', [
             'user_id' => $staffId,
@@ -133,6 +138,24 @@ class StaffControllerTest extends TestCase
             ->assertOk()
             ->assertJsonCount(0, 'data');
 
+        $replacementResponse = $this->postJson('/api/v1/adminapp/tenant/staff', [
+            'nombre_apellido' => 'Nueva Ada',
+            'dni' => '11223344',
+            'email' => 'ADA@example.test',
+            'category_ids' => [$firstCategory->id],
+        ])->assertSuccessful()
+            ->assertJsonPath('data.email', 'ada@example.test');
+
+        $replacementStaffId = $replacementResponse->json('data.id');
+        $this->assertNotSame($staffId, $replacementStaffId);
+        $this->assertSame('Ada Byron', $ticket->fresh()->scannerUser?->nombre_apellido);
+        $this->assertDatabaseHas('users', [
+            'id' => $replacementStaffId,
+            'email' => 'ada@example.test',
+            'active_email' => 'ada@example.test',
+            'deleted_at' => null,
+        ]);
+
     }
 
     public function test_admin_cannot_assign_another_tenants_category(): void