diff --git a/.env.yaml b/.env.yaml
new file mode 100644
index 0000000..4837c71
--- /dev/null
+++ b/.env.yaml
@@ -0,0 +1,4 @@
+HERALD_DSN:
+  description:  Herald client settings. DSN url
+  type: url
+  example: "https://username:password@herald.dev/myAccount/myLibrary/myTransport"
diff --git a/README.md b/README.md
index dc402cd..dbe2bba 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Herald PHP client
 Send beautiful messages from your application.
 
 ## Installation
-```
+```sh
 composer require herald-project/client-php
 ```
 
@@ -74,9 +74,16 @@ need to pass any options to the CLI application
 
 ### By .env
 
-The Herald CLI application loads `.env` before running any commands, allowing you to create a `.env` file 
+The Herald CLI application loads `.env` before running any commands, allowing you to create a `.env` file
 like this:
 
+```sh
+ # run comand to create file
+ cp .env.dist .env # Create config file from template/.dist file
+edit .env # Edit configuration, database settings etc
+ ./vendor/bin/envoi validate  # Run command validate based on meta file .env.yaml
+```
+
 ```ini
 HERALD_DSN=https://x:y@herald.dev/test/test/mandrill
 ```
diff --git a/bin/herald-client b/bin/herald-client
index 775441c..c5387dd 100755
--- a/bin/herald-client
+++ b/bin/herald-client
@@ -2,7 +2,7 @@
 <?php
 
 use Symfony\Component\Console\Application;
-use Symfony\Component\Dotenv\Dotenv;
+use Envoi\Envoi;
 
 $loader = __DIR__.'/../vendor/autoload.php';
 
@@ -20,7 +20,10 @@ if (!file_exists($loader)) {
 
 require $loader;
 
-(new Dotenv())->load(__DIR__.'/../.env');
+// .env validate it.
+$envFilename = __DIR__.'/../.env';
+$envMetaFile = __DIR__.'/../.env.yaml';
+Envoi::init($envFilename, $envMetaFile);
 
 $application = new Application('Herald client', '0.0.1');
 $application->setCatchExceptions(true);
diff --git a/composer.json b/composer.json
index 9a2a6ee..fb28d60 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,11 @@
             "name": "Joost Faassen",
             "email": "j.faassen@onatal.nl",
             "role": "Developer"
+        },
+        {
+          "name": "Kaushik Prajapati",
+          "email": "prajapatikaushik@gmail.com",
+          "role": "Developer"  
         }
     ],
     "support": {
@@ -21,11 +26,12 @@
         "issues": "https://github.com/linkorb/herald-client-php/issues"
     },
     "require": {
-        "guzzlehttp/guzzle": "^4.0|^5.0|^6.0"
+        "guzzlehttp/guzzle": "^4.0|^5.0|^6.0",
+        "linkorb/envoi": "^1.1"
     },
     "require-dev": {
-        "symfony/console": "^2.4|^3.0",
-        "symfony/dotenv": "^3.0"
+        "symfony/console": "^2.4|^4.0",
+        "symfony/dotenv": "^4.0|^3.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
index 2f43e98..cece96b 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,23 +1,23 @@
 {
     "_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#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0239e88f0bce84764c2812eec1aa075f",
+    "content-hash": "45b9881d1f3aa33619aaaeff3aacf424",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.3.0",
+            "version": "6.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699"
+                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/f4db5a78a5ea468d4831de7f0bf9d9415e348699",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/407b0cb880ace85c9b63c5f9551db498cb2d50ba",
+                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba",
                 "shasum": ""
             },
             "require": {
@@ -27,7 +27,7 @@
             },
             "require-dev": {
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.0 || ^5.0",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
                 "psr/log": "^1.0"
             },
             "suggest": {
@@ -36,7 +36,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.2-dev"
+                    "dev-master": "6.3-dev"
                 }
             },
             "autoload": {
@@ -69,7 +69,7 @@
                 "rest",
                 "web service"
             ],
-            "time": "2017-06-22T18:50:49+00:00"
+            "time": "2018-04-22T15:46:56+00:00"
         },
         {
             "name": "guzzlehttp/promises",
@@ -124,32 +124,37 @@
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.4.2",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c"
+                "reference": "239400de7a173fe9901b9ac7c06497751f00727a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/239400de7a173fe9901b9ac7c06497751f00727a",
+                "reference": "239400de7a173fe9901b9ac7c06497751f00727a",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4.0",
-                "psr/http-message": "~1.0"
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
             },
             "provide": {
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "ext-zlib": "*",
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
+            },
+            "suggest": {
+                "zendframework/zend-httphandlerrunner": "Emit PSR-7 responses"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4-dev"
+                    "dev-master": "1.6-dev"
                 }
             },
             "autoload": {
@@ -179,13 +184,105 @@
             "keywords": [
                 "http",
                 "message",
+                "psr-7",
                 "request",
                 "response",
                 "stream",
                 "uri",
                 "url"
             ],
-            "time": "2017-03-20T17:10:46+00:00"
+            "time": "2019-07-01T23:21:34+00:00"
+        },
+        {
+            "name": "linkorb/envoi",
+            "version": "v1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/linkorb/envoi.git",
+                "reference": "60661638ef8c6e0ce54c7faf6ef65994c0827fb8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/linkorb/envoi/zipball/60661638ef8c6e0ce54c7faf6ef65994c0827fb8",
+                "reference": "60661638ef8c6e0ce54c7faf6ef65994c0827fb8",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1",
+                "symfony/console": "^4.0",
+                "symfony/dotenv": "^4.0",
+                "symfony/yaml": "^4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8"
+            },
+            "bin": [
+                "bin/envoi"
+            ],
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Envoi\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Environment variables on steroids",
+            "keywords": [
+                "envoi"
+            ],
+            "time": "2019-10-03T05:08:51+00:00"
+        },
+        {
+            "name": "psr/container",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/container.git",
+                "reference": "b7ce3b176482dbbc1245ebf52b181af44c2cf55f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/container/zipball/b7ce3b176482dbbc1245ebf52b181af44c2cf55f",
+                "reference": "b7ce3b176482dbbc1245ebf52b181af44c2cf55f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Container\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common Container Interface (PHP FIG PSR-11)",
+            "homepage": "https://github.com/php-fig/container",
+            "keywords": [
+                "PSR-11",
+                "container",
+                "container-interface",
+                "container-interop",
+                "psr"
+            ],
+            "time": "2017-02-14T16:28:37+00:00"
         },
         {
             "name": "psr/http-message",
@@ -236,36 +333,33 @@
                 "response"
             ],
             "time": "2016-08-06T14:39:51+00:00"
-        }
-    ],
-    "packages-dev": [
+        },
         {
-            "name": "psr/log",
-            "version": "1.0.2",
+            "name": "ralouphie/getallheaders",
+            "version": "3.0.3",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/log.git",
-                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d"
+                "url": "https://github.com/ralouphie/getallheaders.git",
+                "reference": "120b605dfeb996808c31b6477290a714d356e822"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
-                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822",
+                "reference": "120b605dfeb996808c31b6477290a714d356e822",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0"
+                "php": ">=5.6"
             },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0.x-dev"
-                }
+            "require-dev": {
+                "php-coveralls/php-coveralls": "^2.1",
+                "phpunit/phpunit": "^5 || ^6.5"
             },
+            "type": "library",
             "autoload": {
-                "psr-4": {
-                    "Psr\\Log\\": "Psr/Log/"
-                }
+                "files": [
+                    "src/getallheaders.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -273,49 +367,49 @@
             ],
             "authors": [
                 {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
+                    "name": "Ralph Khattar",
+                    "email": "ralph.khattar@gmail.com"
                 }
             ],
-            "description": "Common interface for logging libraries",
-            "homepage": "https://github.com/php-fig/log",
-            "keywords": [
-                "log",
-                "psr",
-                "psr-3"
-            ],
-            "time": "2016-10-10T12:19:37+00:00"
+            "description": "A polyfill for getallheaders.",
+            "time": "2019-03-08T08:55:37+00:00"
         },
         {
             "name": "symfony/console",
-            "version": "v3.4.6",
+            "version": "v4.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "067339e9b8ec30d5f19f5950208893ff026b94f7"
+                "reference": "929ddf360d401b958f611d44e726094ab46a7369"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/067339e9b8ec30d5f19f5950208893ff026b94f7",
-                "reference": "067339e9b8ec30d5f19f5950208893ff026b94f7",
+                "url": "https://api.github.com/repos/symfony/console/zipball/929ddf360d401b958f611d44e726094ab46a7369",
+                "reference": "929ddf360d401b958f611d44e726094ab46a7369",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8",
-                "symfony/debug": "~2.8|~3.0|~4.0",
-                "symfony/polyfill-mbstring": "~1.0"
+                "php": "^7.1.3",
+                "symfony/polyfill-mbstring": "~1.0",
+                "symfony/polyfill-php73": "^1.8",
+                "symfony/service-contracts": "^1.1"
             },
             "conflict": {
                 "symfony/dependency-injection": "<3.4",
+                "symfony/event-dispatcher": "<4.3",
                 "symfony/process": "<3.3"
             },
+            "provide": {
+                "psr/log-implementation": "1.0"
+            },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "~3.3|~4.0",
+                "symfony/config": "~3.4|~4.0",
                 "symfony/dependency-injection": "~3.4|~4.0",
-                "symfony/event-dispatcher": "~2.8|~3.0|~4.0",
+                "symfony/event-dispatcher": "^4.3",
                 "symfony/lock": "~3.4|~4.0",
-                "symfony/process": "~3.3|~4.0"
+                "symfony/process": "~3.4|~4.0",
+                "symfony/var-dumper": "^4.3"
             },
             "suggest": {
                 "psr/log": "For using the console logger",
@@ -326,7 +420,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "4.3-dev"
                 }
             },
             "autoload": {
@@ -353,41 +447,37 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2018-02-26T15:46:28+00:00"
+            "time": "2019-10-07T12:36:49+00:00"
         },
         {
-            "name": "symfony/debug",
-            "version": "v4.0.6",
+            "name": "symfony/dotenv",
+            "version": "v4.3.5",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/debug.git",
-                "reference": "1721e4e7effb23480966690cdcdc7d2a4152d489"
+                "url": "https://github.com/symfony/dotenv.git",
+                "reference": "1785b18148a016b8f4e6a612291188d568e1f9cd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/debug/zipball/1721e4e7effb23480966690cdcdc7d2a4152d489",
-                "reference": "1721e4e7effb23480966690cdcdc7d2a4152d489",
+                "url": "https://api.github.com/repos/symfony/dotenv/zipball/1785b18148a016b8f4e6a612291188d568e1f9cd",
+                "reference": "1785b18148a016b8f4e6a612291188d568e1f9cd",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
-                "psr/log": "~1.0"
-            },
-            "conflict": {
-                "symfony/http-kernel": "<3.4"
+                "php": "^7.1.3"
             },
             "require-dev": {
-                "symfony/http-kernel": "~3.4|~4.0"
+                "symfony/process": "~3.4|~4.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.3-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Symfony\\Component\\Debug\\": ""
+                    "Symfony\\Component\\Dotenv\\": ""
                 },
                 "exclude-from-classmap": [
                     "/Tests/"
@@ -407,42 +497,47 @@
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony Debug Component",
+            "description": "Registers environment variables from a .env file",
             "homepage": "https://symfony.com",
-            "time": "2018-02-28T21:50:02+00:00"
+            "keywords": [
+                "dotenv",
+                "env",
+                "environment"
+            ],
+            "time": "2019-08-03T21:50:52+00:00"
         },
         {
-            "name": "symfony/dotenv",
-            "version": "v3.4.6",
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.12.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/dotenv.git",
-                "reference": "66265f80c0f585cd6aec3fbdfc4ffdf7a0d75992"
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "550ebaac289296ce228a706d0867afc34687e3f4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/dotenv/zipball/66265f80c0f585cd6aec3fbdfc4ffdf7a0d75992",
-                "reference": "66265f80c0f585cd6aec3fbdfc4ffdf7a0d75992",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/550ebaac289296ce228a706d0867afc34687e3f4",
+                "reference": "550ebaac289296ce228a706d0867afc34687e3f4",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8"
+                "php": ">=5.3.3"
             },
-            "require-dev": {
-                "symfony/process": "~3.2|~4.0"
+            "suggest": {
+                "ext-ctype": "For best performance"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "1.12-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Symfony\\Component\\Dotenv\\": ""
+                    "Symfony\\Polyfill\\Ctype\\": ""
                 },
-                "exclude-from-classmap": [
-                    "/Tests/"
+                "files": [
+                    "bootstrap.php"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -451,35 +546,36 @@
             ],
             "authors": [
                 {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
                 },
                 {
                     "name": "Symfony Community",
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Registers environment variables from a .env file",
+            "description": "Symfony polyfill for ctype functions",
             "homepage": "https://symfony.com",
             "keywords": [
-                "dotenv",
-                "env",
-                "environment"
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
             ],
-            "time": "2018-01-03T17:14:19+00:00"
+            "time": "2019-08-06T08:03:45+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.7.0",
+            "version": "v1.12.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "78be803ce01e55d3491c1397cf1c64beb9c1b63b"
+                "reference": "b42a2f66e8f1b15ccf25652c3424265923eb4f17"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/78be803ce01e55d3491c1397cf1c64beb9c1b63b",
-                "reference": "78be803ce01e55d3491c1397cf1c64beb9c1b63b",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/b42a2f66e8f1b15ccf25652c3424265923eb4f17",
+                "reference": "b42a2f66e8f1b15ccf25652c3424265923eb4f17",
                 "shasum": ""
             },
             "require": {
@@ -491,7 +587,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.7-dev"
+                    "dev-master": "1.12-dev"
                 }
             },
             "autoload": {
@@ -525,9 +621,185 @@
                 "portable",
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