diff --git a/app/code/Magento/QuoteGraphQl/Model/Resolver/CartEmail.php b/app/code/Magento/QuoteGraphQl/Model/Resolver/CartEmail.php
new file mode 100644
index 000000000000..8d0cb114d831
--- /dev/null
+++ b/app/code/Magento/QuoteGraphQl/Model/Resolver/CartEmail.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver;
+
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Quote\Model\Quote;
+use Magento\QuoteGraphQl\Model\Cart\GetCartForUser;
+
+/**
+ * @inheritdoc
+ */
+class CartEmail implements ResolverInterface
+{
+    /**
+     * @var GetCartForUser
+     */
+    private $getCartForUser;
+
+    /**
+     * @param GetCartForUser $getCartForUser
+     */
+    public function __construct(
+        GetCartForUser $getCartForUser
+    ) {
+        $this->getCartForUser = $getCartForUser;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
+    {
+        if (!isset($value['model'])) {
+            throw new LocalizedException(__('"model" value should be specified'));
+        }
+        /** @var Quote $cart */
+        $cart = $value['model'];
+
+        return $cart->getCustomerEmail();
+    }
+}
diff --git a/app/code/Magento/QuoteGraphQl/Model/Resolver/SetGuestEmailOnCart.php b/app/code/Magento/QuoteGraphQl/Model/Resolver/SetGuestEmailOnCart.php
new file mode 100644
index 000000000000..d621057348b5
--- /dev/null
+++ b/app/code/Magento/QuoteGraphQl/Model/Resolver/SetGuestEmailOnCart.php
@@ -0,0 +1,95 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver;
+
+use Magento\Framework\Exception\CouldNotSaveException;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Framework\Validator\EmailAddress as EmailAddressValidator;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\QuoteGraphQl\Model\Cart\GetCartForUser;
+
+/**
+ * @inheritdoc
+ */
+class SetGuestEmailOnCart implements ResolverInterface
+{
+    /**
+     * @var CartRepositoryInterface
+     */
+    private $cartRepository;
+
+    /**
+     * @var GetCartForUser
+     */
+    private $getCartForUser;
+
+    /**
+     * @var EmailAddressValidator
+     */
+    private $emailValidator;
+
+    /**
+     * @param GetCartForUser $getCartForUser
+     * @param CartRepositoryInterface $cartRepository
+     * @param EmailAddressValidator $emailValidator
+     */
+    public function __construct(
+        GetCartForUser $getCartForUser,
+        CartRepositoryInterface $cartRepository,
+        EmailAddressValidator $emailValidator
+    ) {
+        $this->getCartForUser = $getCartForUser;
+        $this->cartRepository = $cartRepository;
+        $this->emailValidator = $emailValidator;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
+    {
+        if (!isset($args['input']['cart_id']) || empty($args['input']['cart_id'])) {
+            throw new GraphQlInputException(__('Required parameter "cart_id" is missing'));
+        }
+        $maskedCartId = $args['input']['cart_id'];
+
+        if (!isset($args['input']['email']) || empty($args['input']['email'])) {
+            throw new GraphQlInputException(__('Required parameter "email" is missing'));
+        }
+
+        if (false === $this->emailValidator->isValid($args['input']['email'])) {
+            throw new GraphQlInputException(__('Invalid email format'));
+        }
+        $email = $args['input']['email'];
+
+        $currentUserId = $context->getUserId();
+
+        if ($currentUserId !== 0) {
+            throw new GraphQlInputException(__('The request is not allowed for logged in customers'));
+        }
+
+        $cart = $this->getCartForUser->execute($maskedCartId, $currentUserId);
+        $cart->setCustomerEmail($email);
+
+        try {
+            $this->cartRepository->save($cart);
+        } catch (CouldNotSaveException $e) {
+            throw new LocalizedException(__($e->getMessage()), $e);
+        }
+
+        return [
+            'cart' => [
+                'model' => $cart,
+            ],
+        ];
+    }
+}
diff --git a/app/code/Magento/QuoteGraphQl/etc/schema.graphqls b/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
index 70690b102306..711e6cbc7f5f 100644
--- a/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
+++ b/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
@@ -17,6 +17,7 @@ type Mutation {
     setBillingAddressOnCart(input: SetBillingAddressOnCartInput): SetBillingAddressOnCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\SetBillingAddressOnCart")
     setShippingMethodsOnCart(input: SetShippingMethodsOnCartInput): SetShippingMethodsOnCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\SetShippingMethodsOnCart")
     setPaymentMethodOnCart(input: SetPaymentMethodOnCartInput): SetPaymentMethodOnCartOutput @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\SetPaymentMethodOnCart")
+    setGuestEmailOnCart(input: SetGuestEmailOnCartInput): SetGuestEmailOnCartOutput @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\SetGuestEmailOnCart")
     placeOrder(input: PlaceOrderInput): PlaceOrderOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\PlaceOrder")
 }
 
@@ -129,6 +130,11 @@ input PaymentMethodInput {
     purchase_order_number: String @doc(description:"Purchase order number")
 }
 
+input SetGuestEmailOnCartInput {
+    cart_id: String!
+    email: String!
+}
+
 type CartPrices {
     grand_total: Money
     subtotal_including_tax: Money
@@ -169,6 +175,7 @@ type PlaceOrderOutput {
 type Cart {
     items: [CartItemInterface] @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\CartItems")
     applied_coupon: AppliedCoupon @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\AppliedCoupon")
+    email: String @resolver (class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\CartEmail")
     shipping_addresses: [CartAddress]! @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\ShippingAddresses")
     billing_address: CartAddress! @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\BillingAddress")
     available_payment_methods: [AvailablePaymentMethod]  @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\AvailablePaymentMethods") @doc(description: "Available payment methods")
@@ -272,6 +279,10 @@ type RemoveItemFromCartOutput {
     cart: Cart!
 }
 
+type SetGuestEmailOnCartOutput {
+    cart: Cart!
+}
+
 type SimpleCartItem implements CartItemInterface @doc(description: "Simple Cart Item") {
     customizable_options: [SelectedCustomizableOption] @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\CustomizableOptions")
 }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartEmailTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartEmailTest.php
new file mode 100644
index 000000000000..951fe08db5e3
--- /dev/null
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartEmailTest.php
@@ -0,0 +1,125 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Customer;
+
+use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
+use Magento\Integration\Api\CustomerTokenServiceInterface;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for getting email from cart
+ */
+class GetCartEmailTest extends GraphQlAbstract
+{
+    /**
+     * @var GetMaskedQuoteIdByReservedOrderId
+     */
+    private $getMaskedQuoteIdByReservedOrderId;
+
+    /**
+     * @var CustomerTokenServiceInterface
+     */
+    private $customerTokenService;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
+        $this->customerTokenService = $objectManager->get(CustomerTokenServiceInterface::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     */
+    public function testGetCartEmail()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+
+        $query = $this->getQuery($maskedQuoteId);
+        $response = $this->graphQlQuery($query, [], '', $this->getHeaderMap());
+
+        $this->assertArrayHasKey('cart', $response);
+        $this->assertArrayHasKey('email', $response['cart']);
+        $this->assertEquals('customer@example.com', $response['cart']['email']);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException \Exception
+     * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
+     */
+    public function testGetCartEmailFromNonExistentCart()
+    {
+        $maskedQuoteId = 'non_existent_masked_id';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlQuery($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * _security
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/set_guest_email.php
+     */
+    public function testGetEmailFromGuestCart()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->expectExceptionMessage(
+            "The current user cannot perform operations on cart \"{$maskedQuoteId}\""
+        );
+        $this->graphQlQuery($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * _security
+     * @magentoApiDataFixture Magento/Customer/_files/three_customers.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     */
+    public function testGetEmailFromAnotherCustomerCart()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->expectExceptionMessage(
+            "The current user cannot perform operations on cart \"{$maskedQuoteId}\""
+        );
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap('customer3@search.example.com'));
+    }
+
+    /**
+     * @param string $maskedQuoteId
+     * @return string
+     */
+    private function getQuery(string $maskedQuoteId): string
+    {
+        return <<<QUERY
+{
+  cart(cart_id:"$maskedQuoteId") {    
+    email
+  }
+}
+QUERY;
+    }
+
+    /**
+     * @param string $username
+     * @param string $password
+     * @return array
+     */
+    private function getHeaderMap(string $username = 'customer@example.com', string $password = 'password'): array
+    {
+        $customerToken = $this->customerTokenService->createCustomerAccessToken($username, $password);
+        $headerMap = ['Authorization' => 'Bearer ' . $customerToken];
+        return $headerMap;
+    }
+}
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php
index 553408880baa..6b15f947a247 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php
@@ -493,6 +493,24 @@ public function testSetBillingAddressWithoutRequiredParameters(string $input, st
         $this->graphQlMutation($query);
     }
 
+    /**
+     * @return array
+     */
+    public function dataProviderSetWithoutRequiredParameters(): array
+    {
+        return [
+            'missed_billing_address' => [
+                'cart_id: "cart_id_value"',
+                'Field SetBillingAddressOnCartInput.billing_address of required type BillingAddressInput!'
+                . ' was not provided.',
+            ],
+            'missed_cart_id' => [
+                'billing_address: {}',
+                'Required parameter "cart_id" is missing'
+            ]
+        ];
+    }
+
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
@@ -536,24 +554,6 @@ public function testSetNewBillingAddressWithRedundantStreetLine()
         $this->graphQlMutation($query, [], '', $this->getHeaderMap());
     }
 
-    /**
-     * @return array
-     */
-    public function dataProviderSetWithoutRequiredParameters(): array
-    {
-        return [
-            'missed_billing_address' => [
-                'cart_id: "cart_id_value"',
-                'Field SetBillingAddressOnCartInput.billing_address of required type BillingAddressInput!'
-                . ' was not provided.',
-            ],
-            'missed_cart_id' => [
-                'billing_address: {}',
-                'Required parameter "cart_id" is missing'
-            ]
-        ];
-    }
-
     /**
      * Verify the all the whitelisted fields for a New Address Object
      *
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetGuestEmailOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetGuestEmailOnCartTest.php
new file mode 100644
index 000000000000..a4a84c2f8c74
--- /dev/null
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetGuestEmailOnCartTest.php
@@ -0,0 +1,104 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Customer;
+
+use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
+use Magento\Integration\Api\CustomerTokenServiceInterface;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for setGuestEmailOnCart mutation
+ */
+class SetGuestEmailOnCartTest extends GraphQlAbstract
+{
+    /**
+     * @var CustomerTokenServiceInterface
+     */
+    private $customerTokenService;
+
+    /**
+     * @var GetMaskedQuoteIdByReservedOrderId
+     */
+    private $getMaskedQuoteIdByReservedOrderId;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
+        $this->customerTokenService = $objectManager->get(CustomerTokenServiceInterface::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     *
+     * @expectedException \Exception
+     * @expectedExceptionMessage The request is not allowed for logged in customers
+     */
+    public function testSetGuestEmailOnCartForLoggedInCustomer()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $email = 'some@user.com';
+
+        $query = $this->getQuery($maskedQuoteId, $email);
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * _security
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     *
+     * @expectedException \Exception
+     * @expectedExceptionMessage The request is not allowed for logged in customers
+     */
+    public function testSetGuestEmailOnGuestCart()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $email = 'some@user.com';
+
+        $query = $this->getQuery($maskedQuoteId, $email);
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * Returns GraphQl mutation query for setting email address for a guest
+     *
+     * @param string $maskedQuoteId
+     * @param string $email
+     * @return string
+     */
+    private function getQuery(string $maskedQuoteId, string $email): string
+    {
+        return <<<QUERY
+mutation {
+  setGuestEmailOnCart(input: {
+    cart_id: "$maskedQuoteId"
+    email: "$email"
+  }) {
+    cart {
+      email
+    }
+  }
+}
+QUERY;
+    }
+
+    /**
+     * @param string $username
+     * @param string $password
+     * @return array
+     */
+    private function getHeaderMap(string $username = 'customer@example.com', string $password = 'password'): array
+    {
+        $customerToken = $this->customerTokenService->createCustomerAccessToken($username, $password);
+        $headerMap = ['Authorization' => 'Bearer ' . $customerToken];
+        return $headerMap;
+    }
+}
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartEmailTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartEmailTest.php
new file mode 100644
index 000000000000..8c6ecd075049
--- /dev/null
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartEmailTest.php
@@ -0,0 +1,88 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Guest;
+
+use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for getting email from cart
+ */
+class GetCartEmailTest extends GraphQlAbstract
+{
+    /**
+     * @var GetMaskedQuoteIdByReservedOrderId
+     */
+    private $getMaskedQuoteIdByReservedOrderId;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/set_guest_email.php
+     */
+    public function testGetCartEmail()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+
+        $query = $this->getQuery($maskedQuoteId);
+        $response = $this->graphQlQuery($query);
+
+        $this->assertArrayHasKey('cart', $response);
+        $this->assertArrayHasKey('email', $response['cart']);
+        $this->assertEquals('guest@example.com', $response['cart']['email']);
+    }
+
+    /**
+     * @expectedException \Exception
+     * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
+     */
+    public function testGetCartEmailFromNonExistentCart()
+    {
+        $maskedQuoteId = 'non_existent_masked_id';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlQuery($query);
+    }
+
+    /**
+     * _security
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     */
+    public function testGetCartEmailFromCustomerCart()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->expectExceptionMessage(
+            "The current user cannot perform operations on cart \"{$maskedQuoteId}\""
+        );
+        $this->graphQlQuery($query);
+    }
+
+    /**
+     * @param string $maskedQuoteId
+     * @return string
+     */
+    private function getQuery(string $maskedQuoteId): string
+    {
+        return <<<QUERY
+{
+  cart(cart_id:"$maskedQuoteId") {    
+    email
+  }
+}
+QUERY;
+    }
+}
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php
index 5b0e4cfdb6c5..d2d53220f004 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php
@@ -313,6 +313,24 @@ public function testSetBillingAddressWithoutRequiredParameters(string $input, st
         $this->graphQlMutation($query);
     }
 
+    /**
+     * @return array
+     */
+    public function dataProviderSetWithoutRequiredParameters(): array
+    {
+        return [
+            'missed_billing_address' => [
+                'cart_id: "cart_id_value"',
+                'Field SetBillingAddressOnCartInput.billing_address of required type BillingAddressInput!'
+                . ' was not provided.',
+            ],
+            'missed_cart_id' => [
+                'billing_address: {}',
+                'Required parameter "cart_id" is missing'
+            ]
+        ];
+    }
+
     /**
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
@@ -356,24 +374,6 @@ public function testSetNewBillingAddressRedundantStreetLine()
         $this->graphQlMutation($query);
     }
 
-    /**
-     * @return array
-     */
-    public function dataProviderSetWithoutRequiredParameters(): array
-    {
-        return [
-            'missed_billing_address' => [
-                'cart_id: "cart_id_value"',
-                'Field SetBillingAddressOnCartInput.billing_address of required type BillingAddressInput!'
-                . ' was not provided.',
-            ],
-            'missed_cart_id' => [
-                'billing_address: {}',
-                'Required parameter "cart_id" is missing'
-            ]
-        ];
-    }
-
     /**
      * Verify the all the whitelisted fields for a New Address Object
      *
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetGuestEmailOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetGuestEmailOnCartTest.php
new file mode 100644
index 000000000000..b877dccdeba3
--- /dev/null
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetGuestEmailOnCartTest.php
@@ -0,0 +1,141 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Guest;
+
+use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for setGuestEmailOnCart mutation
+ */
+class SetGuestEmailOnCartTest extends GraphQlAbstract
+{
+    /**
+     * @var GetMaskedQuoteIdByReservedOrderId
+     */
+    private $getMaskedQuoteIdByReservedOrderId;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     */
+    public function testSetGuestEmailOnCart()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $email = 'some@user.com';
+
+        $query = $this->getQuery($maskedQuoteId, $email);
+        $response = $this->graphQlMutation($query);
+
+        $this->assertArrayHasKey('setGuestEmailOnCart', $response);
+        $this->assertArrayHasKey('cart', $response['setGuestEmailOnCart']);
+        $this->assertEquals($email, $response['setGuestEmailOnCart']['cart']['email']);
+    }
+
+    /**
+     * _security
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     */
+    public function testSetGuestEmailOnCustomerCart()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $email = 'some@user.com';
+
+        $query = $this->getQuery($maskedQuoteId, $email);
+
+        $this->expectExceptionMessage(
+            "The current user cannot perform operations on cart \"$maskedQuoteId\""
+        );
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     *
+     * @dataProvider incorrectEmailDataProvider
+     * @param string $email
+     * @param string $exceptionMessage
+     */
+    public function testSetGuestEmailOnCartWithIncorrectEmail(
+        string $email,
+        string $exceptionMessage
+    ) {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+
+        $query = $this->getQuery($maskedQuoteId, $email);
+        $this->expectExceptionMessage($exceptionMessage);
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @return array
+     */
+    public function incorrectEmailDataProvider(): array
+    {
+        return [
+            'wrong_email' => ['some', 'Invalid email format'],
+            'no_email' => ['', 'Required parameter "email" is missing'],
+        ];
+    }
+
+    /**
+     * @expectedException \Exception
+     * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
+     */
+    public function testSetGuestEmailOnNonExistentCart()
+    {
+        $maskedQuoteId = 'non_existent_masked_id';
+        $email = 'some@user.com';
+
+        $query = $this->getQuery($maskedQuoteId, $email);
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException \Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testSetGuestEmailWithEmptyCartId()
+    {
+        $maskedQuoteId = '';
+        $email = 'some@user.com';
+
+        $query = $this->getQuery($maskedQuoteId, $email);
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * Returns GraphQl mutation query for setting email address for a guest
+     *
+     * @param string $maskedQuoteId
+     * @param string $email
+     * @return string
+     */
+    private function getQuery(string $maskedQuoteId, string $email): string
+    {
+        return <<<QUERY
+mutation {
+  setGuestEmailOnCart(input: {
+    cart_id: "$maskedQuoteId"
+    email: "$email"
+  }) {
+    cart {
+      email
+    }
+  }
+}
+QUERY;
+    }
+}
diff --git a/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php b/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php
index 835b2ab81285..833e5a57ac34 100644
--- a/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php
+++ b/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php
@@ -13,6 +13,7 @@
     ->setIsMultiShipping(false)
     ->setReservedOrderId('test_order_with_virtual_product_without_address')
     ->setEmail('store@example.com')
+    ->setCustomerEmail('store@example.com')
     ->addProduct(
         $product->load($product->getId()),
         1
diff --git a/dev/tests/integration/testsuite/Magento/GraphQl/Quote/_files/guest/set_guest_email.php b/dev/tests/integration/testsuite/Magento/GraphQl/Quote/_files/guest/set_guest_email.php
index 4e214f431004..c8084b255239 100644
--- a/dev/tests/integration/testsuite/Magento/GraphQl/Quote/_files/guest/set_guest_email.php
+++ b/dev/tests/integration/testsuite/Magento/GraphQl/Quote/_files/guest/set_guest_email.php
@@ -20,5 +20,5 @@
 $quote = $quoteFactory->create();
 $quoteResource->load($quote, 'test_quote', 'reserved_order_id');
 
-$quote->setCustomerEmail('customer@example.com');
+$quote->setCustomerEmail('guest@example.com');
 $cartRepository->save($quote);