diff --git a/dist/commonjs/lgtm/config.js b/dist/commonjs/lgtm/config.js
index 94e3ca3..75dcf8f 100644
--- a/dist/commonjs/lgtm/config.js
+++ b/dist/commonjs/lgtm/config.js
@@ -1,4 +1,6 @@
 "use strict";
+/* jshint esnext:true */
+
 var config = {};
 
 config.defer = function() {
diff --git a/dist/commonjs/lgtm/helpers/core.js b/dist/commonjs/lgtm/helpers/core.js
index 66fc840..6c17528 100644
--- a/dist/commonjs/lgtm/helpers/core.js
+++ b/dist/commonjs/lgtm/helpers/core.js
@@ -1,5 +1,7 @@
 "use strict";
 var ValidatorBuilder = require("../validator_builder");
+/* jshint esnext:true */
+
 
 function present(value) {
   if (typeof value === 'string') {
@@ -26,13 +28,13 @@ function checkEmail(value, options) {
   }
 
   // http://stackoverflow.com/a/46181/11236
-  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
+  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
   return regexp.test(value);
 }
 
 function checkMinLength(minLength) {
   if (minLength === null || minLength === undefined) {
-    throw new Error('must specify a min length')
+    throw new Error('must specify a min length');
   }
 
   return function(value) {
@@ -46,7 +48,7 @@ function checkMinLength(minLength) {
 
 function checkMaxLength(maxLength) {
   if (maxLength === null || maxLength === undefined) {
-    throw new Error('must specify a max length')
+    throw new Error('must specify a max length');
   }
 
   return function(value) {
diff --git a/dist/commonjs/lgtm/object_validator.js b/dist/commonjs/lgtm/object_validator.js
index 57a837a..951ddbc 100644
--- a/dist/commonjs/lgtm/object_validator.js
+++ b/dist/commonjs/lgtm/object_validator.js
@@ -8,6 +8,8 @@ var keys = __dependency1__.keys;
 var forEach = __dependency1__.forEach;
 var get = __dependency1__.get;
 var uniq = __dependency1__.uniq;
+/* jshint esnext:true */
+
 
 function ObjectValidator() {
   this._validations  = {};
@@ -42,7 +44,7 @@ ObjectValidator.prototype = {
     for (var i = 0; i < dependentAttributes.length; i++) {
       var attr = dependentAttributes[i];
       if (!contains(dependentsForParent, attr)) {
-        dependentsForParent.push(attr)
+        dependentsForParent.push(attr);
       }
     }
   },
diff --git a/dist/commonjs/lgtm/utils.js b/dist/commonjs/lgtm/utils.js
index 777d431..578287c 100644
--- a/dist/commonjs/lgtm/utils.js
+++ b/dist/commonjs/lgtm/utils.js
@@ -1,5 +1,7 @@
 "use strict";
 var config = require("./config");
+/* jshint esnext:true */
+
 
 /**
  * Iteration
diff --git a/dist/commonjs/lgtm/validator_builder.js b/dist/commonjs/lgtm/validator_builder.js
index 46b5b5e..05e9f70 100644
--- a/dist/commonjs/lgtm/validator_builder.js
+++ b/dist/commonjs/lgtm/validator_builder.js
@@ -3,6 +3,8 @@ var ObjectValidator = require("./object_validator");
 var __dependency1__ = require("./utils");
 var getProperties = __dependency1__.getProperties;
 var all = __dependency1__.all;
+/* jshint esnext:true */
+
 
 function ValidatorBuilder() {
   this._validator = new ObjectValidator();
diff --git a/dist/lgtm-standalone.js b/dist/lgtm-standalone.js
index 32239fc..81ef6d6 100644
--- a/dist/lgtm-standalone.js
+++ b/dist/lgtm-standalone.js
@@ -65,6 +65,8 @@ exports.helpers = helpers;
 exports.ObjectValidator = ObjectValidator;
 },{"./lgtm/config":3,"./lgtm/helpers/core":4,"./lgtm/object_validator":5,"./lgtm/validator_builder":7}],3:[function(require,module,exports){
 "use strict";
+/* jshint esnext:true */
+
 var config = {};
 
 config.defer = function() {
@@ -76,6 +78,8 @@ module.exports = config;
 },{}],4:[function(require,module,exports){
 "use strict";
 var ValidatorBuilder = require("../validator_builder");
+/* jshint esnext:true */
+
 
 function present(value) {
   if (typeof value === 'string') {
@@ -85,19 +89,30 @@ function present(value) {
   return value !== '' && value !== null && value !== undefined;
 }
 
-function checkEmail(value) {
+function checkEmail(value, options) {
   if (typeof value === 'string') {
     value = value.trim();
   }
 
+  if (!options) {
+    options = {};
+  }
+
+  if (options.strictCharacters) {
+    var strictCharactersRegexp = /^[\x20-\x7F]*$/;
+    if (!strictCharactersRegexp.test(value)) {
+      return false;
+    }
+  }
+
   // http://stackoverflow.com/a/46181/11236
-  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
+  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
   return regexp.test(value);
 }
 
 function checkMinLength(minLength) {
   if (minLength === null || minLength === undefined) {
-    throw new Error('must specify a min length')
+    throw new Error('must specify a min length');
   }
 
   return function(value) {
@@ -111,7 +126,7 @@ function checkMinLength(minLength) {
 
 function checkMaxLength(maxLength) {
   if (maxLength === null || maxLength === undefined) {
-    throw new Error('must specify a max length')
+    throw new Error('must specify a max length');
   }
 
   return function(value) {
@@ -162,6 +177,8 @@ var keys = __dependency1__.keys;
 var forEach = __dependency1__.forEach;
 var get = __dependency1__.get;
 var uniq = __dependency1__.uniq;
+/* jshint esnext:true */
+
 
 function ObjectValidator() {
   this._validations  = {};
@@ -196,7 +213,7 @@ ObjectValidator.prototype = {
     for (var i = 0; i < dependentAttributes.length; i++) {
       var attr = dependentAttributes[i];
       if (!contains(dependentsForParent, attr)) {
-        dependentsForParent.push(attr)
+        dependentsForParent.push(attr);
       }
     }
   },
@@ -320,6 +337,8 @@ module.exports = ObjectValidator;
 },{"./config":3,"./utils":6}],6:[function(require,module,exports){
 "use strict";
 var config = require("./config");
+/* jshint esnext:true */
+
 
 /**
  * Iteration
@@ -452,6 +471,8 @@ var ObjectValidator = require("./object_validator");
 var __dependency1__ = require("./utils");
 var getProperties = __dependency1__.getProperties;
 var all = __dependency1__.all;
+/* jshint esnext:true */
+
 
 function ValidatorBuilder() {
   this._validator = new ObjectValidator();
diff --git a/dist/lgtm.js b/dist/lgtm.js
index 88039da..e92f89a 100644
--- a/dist/lgtm.js
+++ b/dist/lgtm.js
@@ -48,6 +48,8 @@ exports.helpers = helpers;
 exports.ObjectValidator = ObjectValidator;
 },{"./lgtm/config":2,"./lgtm/helpers/core":3,"./lgtm/object_validator":4,"./lgtm/validator_builder":6}],2:[function(require,module,exports){
 "use strict";
+/* jshint esnext:true */
+
 var config = {};
 
 config.defer = function() {
@@ -59,6 +61,8 @@ module.exports = config;
 },{}],3:[function(require,module,exports){
 "use strict";
 var ValidatorBuilder = require("../validator_builder");
+/* jshint esnext:true */
+
 
 function present(value) {
   if (typeof value === 'string') {
@@ -68,19 +72,30 @@ function present(value) {
   return value !== '' && value !== null && value !== undefined;
 }
 
-function checkEmail(value) {
+function checkEmail(value, options) {
   if (typeof value === 'string') {
     value = value.trim();
   }
 
+  if (!options) {
+    options = {};
+  }
+
+  if (options.strictCharacters) {
+    var strictCharactersRegexp = /^[\x20-\x7F]*$/;
+    if (!strictCharactersRegexp.test(value)) {
+      return false;
+    }
+  }
+
   // http://stackoverflow.com/a/46181/11236
-  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
+  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
   return regexp.test(value);
 }
 
 function checkMinLength(minLength) {
   if (minLength === null || minLength === undefined) {
-    throw new Error('must specify a min length')
+    throw new Error('must specify a min length');
   }
 
   return function(value) {
@@ -94,7 +109,7 @@ function checkMinLength(minLength) {
 
 function checkMaxLength(maxLength) {
   if (maxLength === null || maxLength === undefined) {
-    throw new Error('must specify a max length')
+    throw new Error('must specify a max length');
   }
 
   return function(value) {
@@ -145,6 +160,8 @@ var keys = __dependency1__.keys;
 var forEach = __dependency1__.forEach;
 var get = __dependency1__.get;
 var uniq = __dependency1__.uniq;
+/* jshint esnext:true */
+
 
 function ObjectValidator() {
   this._validations  = {};
@@ -179,7 +196,7 @@ ObjectValidator.prototype = {
     for (var i = 0; i < dependentAttributes.length; i++) {
       var attr = dependentAttributes[i];
       if (!contains(dependentsForParent, attr)) {
-        dependentsForParent.push(attr)
+        dependentsForParent.push(attr);
       }
     }
   },
@@ -303,6 +320,8 @@ module.exports = ObjectValidator;
 },{"./config":2,"./utils":5}],5:[function(require,module,exports){
 "use strict";
 var config = require("./config");
+/* jshint esnext:true */
+
 
 /**
  * Iteration
@@ -435,6 +454,8 @@ var ObjectValidator = require("./object_validator");
 var __dependency1__ = require("./utils");
 var getProperties = __dependency1__.getProperties;
 var all = __dependency1__.all;
+/* jshint esnext:true */
+
 
 function ValidatorBuilder() {
   this._validator = new ObjectValidator();
diff --git a/src/lgtm/config.js b/src/lgtm/config.js
index f72b3d5..47e2aa9 100644
--- a/src/lgtm/config.js
+++ b/src/lgtm/config.js
@@ -1,3 +1,5 @@
+/* jshint esnext:true */
+
 var config = {};
 
 config.defer = function() {
diff --git a/src/lgtm/helpers/core.js b/src/lgtm/helpers/core.js
index fa8ecbd..d45c3fa 100644
--- a/src/lgtm/helpers/core.js
+++ b/src/lgtm/helpers/core.js
@@ -1,3 +1,5 @@
+/* jshint esnext:true */
+
 import ValidatorBuilder from '../validator_builder';
 
 function present(value) {
@@ -25,13 +27,13 @@ function checkEmail(value, options) {
   }
 
   // http://stackoverflow.com/a/46181/11236
-  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
+  var regexp = /^(([^<>()\[\]\\.,;:\s@\"]+(\.[^<>()\[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
   return regexp.test(value);
 }
 
 function checkMinLength(minLength) {
   if (minLength === null || minLength === undefined) {
-    throw new Error('must specify a min length')
+    throw new Error('must specify a min length');
   }
 
   return function(value) {
@@ -45,7 +47,7 @@ function checkMinLength(minLength) {
 
 function checkMaxLength(maxLength) {
   if (maxLength === null || maxLength === undefined) {
-    throw new Error('must specify a max length')
+    throw new Error('must specify a max length');
   }
 
   return function(value) {
diff --git a/src/lgtm/object_validator.js b/src/lgtm/object_validator.js
index cee7972..241e017 100644
--- a/src/lgtm/object_validator.js
+++ b/src/lgtm/object_validator.js
@@ -1,3 +1,5 @@
+/* jshint esnext:true */
+
 import config from './config';
 import { all, resolve, contains, keys, forEach, get, uniq } from './utils';
 
@@ -34,7 +36,7 @@ ObjectValidator.prototype = {
     for (var i = 0; i < dependentAttributes.length; i++) {
       var attr = dependentAttributes[i];
       if (!contains(dependentsForParent, attr)) {
-        dependentsForParent.push(attr)
+        dependentsForParent.push(attr);
       }
     }
   },
diff --git a/src/lgtm/utils.js b/src/lgtm/utils.js
index 3926269..c6b8a07 100644
--- a/src/lgtm/utils.js
+++ b/src/lgtm/utils.js
@@ -1,3 +1,5 @@
+/* jshint esnext:true */
+
 import config from './config';
 
 /**
diff --git a/src/lgtm/validator_builder.js b/src/lgtm/validator_builder.js
index ec106b6..ddfe324 100644
--- a/src/lgtm/validator_builder.js
+++ b/src/lgtm/validator_builder.js
@@ -1,3 +1,5 @@
+/* jshint esnext:true */
+
 import ObjectValidator from './object_validator';
 import { getProperties, all } from './utils';