diff --git a/.gitignore b/.gitignore
index 457ceba84..2abedf998 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 .vagrant
 .idea
 application/.env
+application/vendor
\ No newline at end of file
diff --git a/README.md b/README.md
index ddd69114a..bf5431584 100644
--- a/README.md
+++ b/README.md
@@ -4,15 +4,11 @@ https://otus.ru/lessons/razrabotchik-php/?utm_source=github&utm_medium=free&utm_
 
 # Задание
 
-Docker 
-1. Установить Docker себе на локальную машину
-2. Описать инфраструктуру в Docker-compose, которая включает в себя 
-3. nginx (обрабатывает статику, пробрасывает выполнение скриптов в fpm)
-4. php-fpm (соединяется с nginx через unix-сокет)
-5. redis (соединяется с php по порту)
-6. memcached (соединяется с php по порту)
-7. БД подключать как отдельную VM (можно на базе Homestead), либо как контейнер (но тогда не забудьте про директории с данными)
-8. Не забудьте про Composer
+Приложение верификации email
+Реализовать приложение (сервис/функцию) для верификации email.
+Реализация будет в будущем встроена в более крупное решение.
+Минимальный функционал - список строк, которые необходимо проверить на наличие валидных email.
+Валидация по регулярным выражениям и проверке DNS mx записи, без полноценной отправки письма-подтверждения.
 
 # Установка
 
@@ -33,7 +29,8 @@ vagrant ssh
 cd application && cp .env.example .env
 ```
 
-Далее, заполните все пустые строки нужными данными в файле `.env`
+Далее, заполните все пустые строки нужными данными в файле `.env`.
+Особенно важным тут является переменная окружения `DOMAIN_API`
 
 После чего выполните команду
 
@@ -41,9 +38,28 @@ cd application && cp .env.example .env
 sudo docker compose up -d
 ```
 
-Добавьте сайт `mysite.local` в файл `hosts`
+Зайдите внутрь контейнера 
+
+```bash
+docker container exec -it myapp-php-dev bash
+```
+
+Выполните команду
+
+```bash
+cd console
+```
+
+## Запуск и работа скрипта
+
+Для запуска скрипта выполните следующую команду:
+
 ```bash
-127.0.0.1 mysite.local
+php app.php
 ```
 
-Готово!
+Данные для теста скрипт берёт из файла
+
+```text
+/data/www/files/emails.txt
+```
diff --git a/Vagrantfile b/Vagrantfile
index bb54de9d8..b2cfa9fda 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -8,6 +8,9 @@ Vagrant.configure("2") do |config|
   # forwarding ports
   config.vm.network :forwarded_port, guest: 80, host: 80
 
+  # sync current folders to vagrant. I use rsync because of problems with syncing windows and linux
+  config.vm.synced_folder ".", "/vagrant", type: "rsync"
+
   # config resources for the VM
   config.vm.provider "virtualbox" do |v|
     v.memory = 4048
diff --git a/application/.env.example b/application/.env.example
index 4c15d5af3..970f203f6 100644
--- a/application/.env.example
+++ b/application/.env.example
@@ -7,3 +7,5 @@ MYSQL_USER=db_user
 MYSQL_PASSWORD=
 # suffix for names of docker containers
 DOCKER_CONTAINER_SUFFIX=-dev
+# Api to the domain verification service
+DOMAIN_API=
diff --git a/application/composer.json b/application/composer.json
new file mode 100644
index 000000000..7b7a30570
--- /dev/null
+++ b/application/composer.json
@@ -0,0 +1,18 @@
+{
+    "name": "gesparo/hw",
+    "type": "project",
+    "autoload": {
+        "psr-4": {
+            "Gesparo\\Hw\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Maksym Melnyk"
+        }
+    ],
+    "require": {
+        "ext-curl": "*",
+        "vlucas/phpdotenv": "^5.5"
+    }
+}
diff --git a/application/composer.lock b/application/composer.lock
new file mode 100644
index 000000000..074f885f8
--- /dev/null
+++ b/application/composer.lock
@@ -0,0 +1,490 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "0e45f8b7a66b88ba237a3fabe4475635",
+    "packages": [
+        {
+            "name": "graham-campbell/result-type",
+            "version": "v1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/GrahamCampbell/Result-Type.git",
+                "reference": "672eff8cf1d6fe1ef09ca0f89c4b287d6a3eb831"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/GrahamCampbell/Result-Type/zipball/672eff8cf1d6fe1ef09ca0f89c4b287d6a3eb831",
+                "reference": "672eff8cf1d6fe1ef09ca0f89c4b287d6a3eb831",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2.5 || ^8.0",
+                "phpoption/phpoption": "^1.9.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.5.32 || ^9.6.3 || ^10.0.12"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "GrahamCampbell\\ResultType\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                }
+            ],
+            "description": "An Implementation Of The Result Type",
+            "keywords": [
+                "Graham Campbell",
+                "GrahamCampbell",
+                "Result Type",
+                "Result-Type",
+                "result"
+            ],
+            "support": {
+                "issues": "https://github.com/GrahamCampbell/Result-Type/issues",
+                "source": "https://github.com/GrahamCampbell/Result-Type/tree/v1.1.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/graham-campbell/result-type",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-02-25T20:23:15+00:00"
+        },
+        {
+            "name": "phpoption/phpoption",
+            "version": "1.9.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/schmittjoh/php-option.git",
+                "reference": "dd3a383e599f49777d8b628dadbb90cae435b87e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/schmittjoh/php-option/zipball/dd3a383e599f49777d8b628dadbb90cae435b87e",
+                "reference": "dd3a383e599f49777d8b628dadbb90cae435b87e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2.5 || ^8.0"
+            },
+            "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.8.2",
+                "phpunit/phpunit": "^8.5.32 || ^9.6.3 || ^10.0.12"
+            },
+            "type": "library",
+            "extra": {
+                "bamarni-bin": {
+                    "bin-links": true,
+                    "forward-command": true
+                },
+                "branch-alias": {
+                    "dev-master": "1.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpOption\\": "src/PhpOption/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "Apache-2.0"
+            ],
+            "authors": [
+                {
+                    "name": "Johannes M. Schmitt",
+                    "email": "schmittjoh@gmail.com",
+                    "homepage": "https://github.com/schmittjoh"
+                },
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                }
+            ],
+            "description": "Option Type for PHP",
+            "keywords": [
+                "language",
+                "option",
+                "php",
+                "type"
+            ],
+            "support": {
+                "issues": "https://github.com/schmittjoh/php-option/issues",
+                "source": "https://github.com/schmittjoh/php-option/tree/1.9.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpoption/phpoption",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-02-25T19:38:58+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.28.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "ea208ce43cbb04af6867b4fdddb1bdbf84cc28cb"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/ea208ce43cbb04af6867b4fdddb1bdbf84cc28cb",
+                "reference": "ea208ce43cbb04af6867b4fdddb1bdbf84cc28cb",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "provide": {
+                "ext-ctype": "*"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.28-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.28.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-01-26T09:26:14+00:00"
+        },
+        {
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.28.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
+                "reference": "42292d99c55abe617799667f454222c54c60e229"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/42292d99c55abe617799667f454222c54c60e229",
+                "reference": "42292d99c55abe617799667f454222c54c60e229",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "provide": {
+                "ext-mbstring": "*"
+            },
+            "suggest": {
+                "ext-mbstring": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.28-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Mbstring\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for the Mbstring extension",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.28.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-07-28T09:04:16+00:00"
+        },
+        {
+            "name": "symfony/polyfill-php80",
+            "version": "v1.28.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-php80.git",
+                "reference": "6caa57379c4aec19c0a12a38b59b26487dcfe4b5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/6caa57379c4aec19c0a12a38b59b26487dcfe4b5",
+                "reference": "6caa57379c4aec19c0a12a38b59b26487dcfe4b5",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.28-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php80\\": ""
+                },
+                "classmap": [
+                    "Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ion Bazan",
+                    "email": "ion.bazan@gmail.com"
+                },
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-php80/tree/v1.28.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-01-26T09:26:14+00:00"
+        },
+        {
+            "name": "vlucas/phpdotenv",
+            "version": "v5.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/vlucas/phpdotenv.git",
+                "reference": "1a7ea2afc49c3ee6d87061f5a233e3a035d0eae7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/vlucas/phpdotenv/zipball/1a7ea2afc49c3ee6d87061f5a233e3a035d0eae7",
+                "reference": "1a7ea2afc49c3ee6d87061f5a233e3a035d0eae7",
+                "shasum": ""
+            },
+            "require": {
+                "ext-pcre": "*",
+                "graham-campbell/result-type": "^1.0.2",
+                "php": "^7.1.3 || ^8.0",
+                "phpoption/phpoption": "^1.8",
+                "symfony/polyfill-ctype": "^1.23",
+                "symfony/polyfill-mbstring": "^1.23.1",
+                "symfony/polyfill-php80": "^1.23.1"
+            },
+            "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.4.1",
+                "ext-filter": "*",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.30 || ^9.5.25"
+            },
+            "suggest": {
+                "ext-filter": "Required to use the boolean validator."
+            },
+            "type": "library",
+            "extra": {
+                "bamarni-bin": {
+                    "bin-links": true,
+                    "forward-command": true
+                },
+                "branch-alias": {
+                    "dev-master": "5.5-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Dotenv\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                },
+                {
+                    "name": "Vance Lucas",
+                    "email": "vance@vancelucas.com",
+                    "homepage": "https://github.com/vlucas"
+                }
+            ],
+            "description": "Loads environment variables from `.env` to `getenv()`, `$_ENV` and `$_SERVER` automagically.",
+            "keywords": [
+                "dotenv",
+                "env",
+                "environment"
+            ],
+            "support": {
+                "issues": "https://github.com/vlucas/phpdotenv/issues",
+                "source": "https://github.com/vlucas/phpdotenv/tree/v5.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/vlucas/phpdotenv",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-10-16T01:01:54+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "ext-curl": "*"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
+}
diff --git a/application/config/php/Dockerfile b/application/config/php/Dockerfile
index ef84ea5e8..a2d0d0736 100644
--- a/application/config/php/Dockerfile
+++ b/application/config/php/Dockerfile
@@ -1,12 +1,20 @@
 FROM php:fpm
 
 RUN apt-get update \
-	&& apt-get install -y libmemcached-dev libssl-dev zlib1g-dev \
+	&& apt-get install -y libmemcached-dev libssl-dev zlib1g-dev libcurl4-gnutls-dev \
 	&& pecl install redis \
 	&& pecl install memcached-3.2.0 \
 	&& docker-php-ext-enable redis memcached \
 	&& docker-php-ext-install mysqli \
 	&& docker-php-ext-enable mysqli \
+    && docker-php-ext-install curl \
+    && docker-php-ext-enable curl \
     && apt-get install -y git
 
 COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer
+
+WORKDIR /data/www
+
+COPY ./ /data/www
+
+RUN composer install
\ No newline at end of file
diff --git a/application/console/app.php b/application/console/app.php
new file mode 100644
index 000000000..8def4ae1e
--- /dev/null
+++ b/application/console/app.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+use Gesparo\Hw\App;
+
+require __DIR__ . "/../vendor/autoload.php";
+
+(new App())->run();
diff --git a/application/docker-compose.yaml b/application/docker-compose.yaml
index 236bc121d..bb45d19c4 100644
--- a/application/docker-compose.yaml
+++ b/application/docker-compose.yaml
@@ -6,12 +6,12 @@ services:
       - "80:80"
 
   fpm:
-    build: config/php
+    build:
+      context: ./
+      dockerfile: config/php/Dockerfile
     container_name: myapp-php${DOCKER_CONTAINER_SUFFIX}
     ports:
       - ":9000"
-    volumes:
-      - ./:/data/www
     environment:
       MYAPP_MYSQL_DATABASE: ${MYSQL_DATABASE}
       MYAPP_MYSQL_USER: ${MYSQL_USER}
diff --git a/application/files/emails.txt b/application/files/emails.txt
new file mode 100644
index 000000000..27d9a2a36
--- /dev/null
+++ b/application/files/emails.txt
@@ -0,0 +1,8 @@
+mail@mail.ru
+myawesomeemail@invalidsmtpwebsite.com
+googleaccount@gmail.com
+googleaccount@google.com
+existingwebsitewithoutsmtp@example.com
+invalidemail
+login@password
+ivaliddomain@some.r
diff --git a/application/src/App.php b/application/src/App.php
new file mode 100644
index 000000000..122c8c1a2
--- /dev/null
+++ b/application/src/App.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw;
+
+use Dotenv\Dotenv;
+use Gesparo\Hw\Controller\EmailService;
+
+class App
+{
+    public function run(): void
+    {
+        try {
+            Dotenv::createImmutable(PathHelper::getInstance()->getRootPath())->load();
+
+            (new EmailService(
+                $_ENV['DOMAIN_API'],
+                PathHelper::getInstance()->getFilesPath() . 'emails.txt'
+            ))->make();
+        } catch (\Throwable $exception) {
+            (new ExceptionHandler())->handle($exception);
+        }
+    }
+}
diff --git a/application/src/Controller/EmailService.php b/application/src/Controller/EmailService.php
new file mode 100644
index 000000000..6bf3a30a2
--- /dev/null
+++ b/application/src/Controller/EmailService.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Gesparo\Hw\Controller;
+
+use Gesparo\Hw\Email\DomainChecker;
+use Gesparo\Hw\Email\EmailChecker;
+use Gesparo\Hw\Email\FileParser;
+use Gesparo\Hw\Email\Response;
+use Gesparo\Hw\Email\Validator;
+
+class EmailService
+{
+    private string $apiKey;
+    private string $fileWithEmails;
+
+    public function __construct(string $apiKey, string $fileWithEmails)
+    {
+        $this->apiKey = $apiKey;
+        $this->fileWithEmails = $fileWithEmails;
+    }
+
+    public function make(): void
+    {
+        $emailChecker = new EmailChecker(new DomainChecker($this->apiKey));
+        $fileParser = new FileParser($this->fileWithEmails);
+        $validatedEmails = (new Validator($fileParser, $emailChecker))->validate();
+
+        (new Response())->response($validatedEmails);
+    }
+}
diff --git a/application/src/Email/DomainChecker.php b/application/src/Email/DomainChecker.php
new file mode 100644
index 000000000..3385ed133
--- /dev/null
+++ b/application/src/Email/DomainChecker.php
@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw\Email;
+
+use Gesparo\Hw\Exception\EmailException;
+
+class DomainChecker
+{
+    private const MX_RECORD_TYPE = 'MX';
+
+    private string $apiKey;
+
+    public function __construct(string $apiKey)
+    {
+        $this->apiKey = $apiKey;
+    }
+
+    /**
+     * @throws EmailException
+     * @throws \JsonException
+     */
+    public function check(string $domain): bool
+    {
+        $apiResponse = $this->makeRequest($domain);
+
+        $this->checkErrorResponse($apiResponse, $domain);
+
+        return $this->checkIsMX($apiResponse);
+    }
+
+    /**
+     * @throws EmailException
+     * @throws \JsonException
+     */
+    private function makeRequest(string $domain): array
+    {
+        $curl = curl_init();
+        $params = [
+            'domain' => $domain,
+        ];
+
+        curl_setopt($curl, CURLOPT_URL, 'https://api.api-ninjas.com/v1/dnslookup' . '?' . http_build_query($params));
+
+        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+
+        curl_setopt(
+            $curl,
+            CURLOPT_HTTPHEADER,
+            [
+                "X-Api-Key: $this->apiKey"
+            ]
+        );
+
+        $response = curl_exec($curl);
+
+        if ($response === false) {
+            throw EmailException::failToGetResponseFromTheApi($domain, $curl);
+        }
+
+        curl_close($curl);
+
+        return json_decode($response, true, 512, JSON_THROW_ON_ERROR);
+    }
+
+    private function checkIsMX(array $response): bool
+    {
+        foreach ($response as $record) {
+            if (array_key_exists('record_type', $record) && $record['record_type'] === self::MX_RECORD_TYPE) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @throws EmailException
+     */
+    private function checkErrorResponse(array $response, string $domain): void
+    {
+        if (array_key_exists('error', $response)) {
+            throw EmailException::apiRespondWithError($response['error'], $domain);
+        }
+    }
+}
diff --git a/application/src/Email/EmailChecker.php b/application/src/Email/EmailChecker.php
new file mode 100644
index 000000000..69d456511
--- /dev/null
+++ b/application/src/Email/EmailChecker.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw\Email;
+
+use Gesparo\Hw\Exception\EmailException;
+
+class EmailChecker
+{
+    private DomainChecker $domainChecker;
+
+    public function __construct(DomainChecker $domainChecker)
+    {
+        $this->domainChecker = $domainChecker;
+    }
+
+    /**
+     * @throws EmailException
+     * @throws \JsonException
+     */
+    public function check(string $email): bool
+    {
+        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
+            return false;
+        }
+
+        return $this->domainChecker->check($this->getDomainName($email));
+    }
+
+    private function getDomainName(string $email): string
+    {
+        if (preg_match('/@((\w|\d)+[^.]\.[a-z]+)/', strtolower($email), $matches) !== 1) {
+            throw new \LogicException("Cannot get domain name from the email address '$email'");
+        }
+
+        return $matches[1];
+    }
+}
diff --git a/application/src/Email/FileParser.php b/application/src/Email/FileParser.php
new file mode 100644
index 000000000..1626aa517
--- /dev/null
+++ b/application/src/Email/FileParser.php
@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw\Email;
+
+use Gesparo\Hw\Exception\EmailException;
+
+class FileParser
+{
+    private const LIMIT_OF_EMAILS = 100;
+
+    private string $pathToFile;
+    private array $emails;
+
+    /**
+     * @throws EmailException
+     */
+    public function __construct(string $pathToFile)
+    {
+        $this->pathToFile = $pathToFile;
+        $this->emails = $this->getEmailsFromFile();
+    }
+
+    /**
+     * @throws EmailException
+     */
+    private function getEmailsFromFile(): array
+    {
+        $fileDescriptor = $this->openFile();
+        $result = [];
+
+        try {
+            foreach ($this->getFileIterator($fileDescriptor) as $email) {
+                // protection of empty lines
+                if (!is_string($email) || $email === '') {
+                    continue;
+                }
+
+                if (count($result) >= self::LIMIT_OF_EMAILS) {
+                    throw EmailException::tooMuchEmails($this->pathToFile, self::LIMIT_OF_EMAILS);
+                }
+
+                $result[] = $email;
+            }
+        } finally {
+            fclose($fileDescriptor);
+        }
+
+        return $result;
+    }
+
+    /**
+     * @throws EmailException
+     */
+    private function openFile()
+    {
+        if (is_dir($this->pathToFile)) {
+            throw EmailException::pathIsDirectory($this->pathToFile);
+        }
+
+        if (!file_exists($this->pathToFile)) {
+            throw EmailException::fileDoesNotExist($this->pathToFile);
+        }
+
+        if (!is_readable($this->pathToFile)) {
+            throw EmailException::fileIsNotReadable($this->pathToFile);
+        }
+
+        $descriptor = fopen($this->pathToFile, 'rb');
+
+        if ($descriptor === false) {
+            throw EmailException::cannotCreateFileDescriptorForFile($this->pathToFile);
+        }
+
+        return $descriptor;
+    }
+
+    private function getFileIterator($fileDescriptor): \Generator
+    {
+        while (!feof($fileDescriptor)) {
+            yield fgets($fileDescriptor);
+        }
+    }
+
+    public function getEmails(): array
+    {
+        return $this->emails;
+    }
+}
diff --git a/application/src/Email/Response.php b/application/src/Email/Response.php
new file mode 100644
index 000000000..ad7a91bfd
--- /dev/null
+++ b/application/src/Email/Response.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw\Email;
+
+class Response
+{
+    /**
+     * @param ValidateResult[] $validatedEmails
+     * @return void
+     */
+    public function response(array $validatedEmails): void
+    {
+        $dividedEmails = $this->divideEmails($validatedEmails);
+        $message = '';
+
+        if (empty($dividedEmails['valid'])) {
+            $message .= 'There is no valid emails' . PHP_EOL . PHP_EOL;
+        } else {
+            $message .= 'Valid emails:' . PHP_EOL;
+            $message .= implode(PHP_EOL, $dividedEmails['valid']) . PHP_EOL;
+        }
+
+        $message .= PHP_EOL;
+
+        if (empty($dividedEmails['invalid'])) {
+            $message .= 'All emails was valid' . PHP_EOL . PHP_EOL;
+        } else {
+            $message .= 'Invalid emails:' . PHP_EOL;
+            $message .= implode(PHP_EOL, $dividedEmails['invalid']) . PHP_EOL;
+        }
+
+        echo $message;
+    }
+
+    /**
+     * @param ValidateResult[] $validatedEmails
+     * @return mixed
+     */
+    private function divideEmails(array $validatedEmails): array
+    {
+        return array_reduce(
+            $validatedEmails,
+            static function (array $carry, ValidateResult $item) {
+                if ($item->getIsValid()) {
+                    $carry['valid'][] = $item->getEmail();
+                } else {
+                    $carry['invalid'][] = $item->getEmail();
+                }
+
+                return $carry;
+            },
+            ['valid' => [], 'invalid' => []]
+        );
+    }
+}
diff --git a/application/src/Email/ValidateResult.php b/application/src/Email/ValidateResult.php
new file mode 100644
index 000000000..01f0d0507
--- /dev/null
+++ b/application/src/Email/ValidateResult.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw\Email;
+
+class ValidateResult
+{
+    private string $email;
+    private bool $isValid;
+
+    public function __construct(string $email, bool $isValid)
+    {
+        $this->email = $email;
+        $this->isValid = $isValid;
+    }
+
+    public function getEmail(): string
+    {
+        return $this->email;
+    }
+
+    public function getIsValid(): bool
+    {
+        return $this->isValid;
+    }
+}
diff --git a/application/src/Email/Validator.php b/application/src/Email/Validator.php
new file mode 100644
index 000000000..ee4b3c7a8
--- /dev/null
+++ b/application/src/Email/Validator.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw\Email;
+
+use Gesparo\Hw\Exception\EmailException;
+
+class Validator
+{
+    private FileParser $emails;
+    private EmailChecker $checker;
+
+    public function __construct(FileParser $emails, EmailChecker $checker)
+    {
+        $this->emails = $emails;
+        $this->checker = $checker;
+    }
+
+    /**
+     * @return ValidateResult[]
+     * @throws EmailException
+     * @throws \JsonException
+     */
+    public function validate(): array
+    {
+        $result = [];
+
+        foreach ($this->emails->getEmails() as $email) {
+            $email = trim($email);
+            $result[] = new ValidateResult($email, $this->checker->check($email));
+        }
+
+        return $result;
+    }
+}
diff --git a/application/src/Exception/EmailException.php b/application/src/Exception/EmailException.php
new file mode 100644
index 000000000..1f24e0843
--- /dev/null
+++ b/application/src/Exception/EmailException.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw\Exception;
+
+class EmailException extends \Exception
+{
+    public static function pathIsDirectory(string $path): self
+    {
+        return new self("Path '$path' is a directory");
+    }
+
+    public static function fileDoesNotExist(string $path): self
+    {
+        return new self("Cannot find file by path '$path'");
+    }
+
+    public static function fileIsNotReadable(string $path): self
+    {
+        return new self("File '$path' is not readable");
+    }
+
+    public static function cannotCreateFileDescriptorForFile(string $path): self
+    {
+        return new self("Cannot create file descriptor for file '$path'");
+    }
+
+    public static function tooMuchEmails(string $path, int $limit): self
+    {
+        return new self("File '$path' contains more then $limit emails to check");
+    }
+
+    public static function failToGetResponseFromTheApi(string $domain, \CurlHandle $curl): self
+    {
+        return new self(
+            "Fail to send request to the domains api and get the result for domain '$domain'. Error: " . curl_error($curl),
+            curl_errno($curl)
+        );
+    }
+
+    public static function apiRespondWithError(string $errorMessage, string $domain): self
+    {
+        return new self("Api for checking domain responded with error. Error message: '$errorMessage'. Domain: '$domain'");
+    }
+}
diff --git a/application/src/ExceptionHandler.php b/application/src/ExceptionHandler.php
new file mode 100644
index 000000000..a746a0790
--- /dev/null
+++ b/application/src/ExceptionHandler.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw;
+
+class ExceptionHandler
+{
+    public function handle(\Throwable $exception): void
+    {
+        fwrite(STDERR, $this->prepareMessage($exception) . PHP_EOL);
+    }
+
+    /**
+     * @throws \JsonException
+     */
+    private function prepareMessage(\Throwable $exception): string
+    {
+        $trace = json_encode($exception->getTrace(), JSON_PRETTY_PRINT | JSON_THROW_ON_ERROR);
+
+        return <<<EOL
+            Exception: '{$exception->getMessage()}'
+            Code: '{$exception->getCode()}'
+            Trace:
+            
+            $trace
+        EOL;
+    }
+}
diff --git a/application/src/PathHelper.php b/application/src/PathHelper.php
new file mode 100644
index 000000000..3ce6d9adc
--- /dev/null
+++ b/application/src/PathHelper.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gesparo\Hw;
+
+class PathHelper
+{
+    private static ?self $instance = null;
+
+    private string $root;
+
+    private function __construct(string $root)
+    {
+        $this->root = $root;
+    }
+
+    public static function getInstance(): self
+    {
+        if (self::$instance === null) {
+            self::$instance = new self($_SERVER['PWD'] . '/../');
+        }
+
+        return self::$instance;
+    }
+
+    public function getRootPath(): string
+    {
+        return $this->root;
+    }
+
+    public function getFilesPath(): string
+    {
+        return $this->getRootPath() . 'files/';
+    }
+}