diff --git a/application/Espo/Resources/i18n/en_US/Global.json b/application/Espo/Resources/i18n/en_US/Global.json
index 33481f8969..007ebb4722 100644
--- a/application/Espo/Resources/i18n/en_US/Global.json
+++ b/application/Espo/Resources/i18n/en_US/Global.json
@@ -265,6 +265,7 @@
         "fieldShouldBeGreater": "{field} shouldn't be less then {value}",
         "fieldBadPasswordConfirm": "{field} not confirmed properly",
         "fieldMaxFileSizeError": "File should not exceed {max} Mb",
+        "fieldValueDuplicate": "Duplicate value",
         "fieldIsUploading": "Uploading in progress",
         "resetPreferencesDone": "Preferences has been reset to defaults",
         "confirmation": "Are you sure?",
diff --git a/client/src/views/fields/email.js b/client/src/views/fields/email.js
index c4467d988b..645a937cf2 100644
--- a/client/src/views/fields/email.js
+++ b/client/src/views/fields/email.js
@@ -42,20 +42,33 @@ Espo.define('views/fields/email', 'views/fields/varchar', function (Dep) {
 
         validateEmailData: function () {
             var data = this.model.get(this.dataFieldName);
-            if (data && data.length) {
-                var re = /\S+@+\S+/;
-                var notValid = false;
-                data.forEach(function (row, i) {
-                    var emailAddress = row.emailAddress;
-                    if (!re.test(emailAddress) && emailAddress.indexOf(this.erasedPlaceholder) !== 0) {
-                        var msg = this.translate('fieldShouldBeEmail', 'messages').replace('{field}', this.getLabelText());
-                        this.showValidationMessage(msg, 'div.email-address-block:nth-child(' + (i + 1).toString() + ') input');
-                        notValid = true;
-                    }
-                }, this);
-                if (notValid) {
-                    return true;
+            if (!data || !data.length) return;
+
+            var addressList = [];
+
+            var re = /^(([^<>()\[\]\\.,;:\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 notValid = false;
+
+            data.forEach(function (row, i) {
+                var address = row.emailAddress;
+                var addressLowerCase = String(address).toLowerCase();
+                if (!re.test(addressLowerCase) && address.indexOf(this.erasedPlaceholder) !== 0) {
+                    var msg = this.translate('fieldShouldBeEmail', 'messages').replace('{field}', this.getLabelText());
+                    this.showValidationMessage(msg, 'div.email-address-block:nth-child(' + (i + 1).toString() + ') input');
+                    notValid = true;
+                    return;
                 }
+                if (~addressList.indexOf(addressLowerCase)) {
+                    var msg = this.translate('fieldValueDuplicate', 'messages').replace('{field}', this.getLabelText());
+                    this.showValidationMessage(msg, 'div.email-address-block:nth-child(' + (i + 1).toString() + ') input');
+                    notValid = true;
+                    return;
+                }
+                addressList.push(addressLowerCase);
+            }, this);
+            if (notValid) {
+                return true;
             }
         },
 
diff --git a/client/src/views/fields/phone.js b/client/src/views/fields/phone.js
index 07a435f86f..98ded90f96 100644
--- a/client/src/views/fields/phone.js
+++ b/client/src/views/fields/phone.js
@@ -38,7 +38,7 @@ Espo.define('views/fields/phone', 'views/fields/varchar', function (Dep) {
 
         listTemplate: 'fields/phone/list',
 
-        validations: ['required'],
+        validations: ['required', 'phoneData'],
 
         validateRequired: function () {
             if (this.isRequired()) {
@@ -50,6 +50,30 @@ Espo.define('views/fields/phone', 'views/fields/varchar', function (Dep) {
             }
         },
 
+        validatePhoneData: function () {
+            var data = this.model.get(this.dataFieldName);
+            if (!data || !data.length) return;
+
+            var numberList = [];
+
+            var notValid = false;
+            data.forEach(function (row, i) {
+                var number = row.phoneNumber;
+                var numberClean = String(number).replace(/[\s\+]/g, '');
+
+                if (~numberList.indexOf(numberClean)) {
+                    var msg = this.translate('fieldValueDuplicate', 'messages').replace('{field}', this.getLabelText());
+                    this.showValidationMessage(msg, 'div.phone-number-block:nth-child(' + (i + 1).toString() + ') input');
+                    notValid = true;
+                    return;
+                }
+                numberList.push(numberClean);
+            }, this);
+            if (notValid) {
+                return true;
+            }
+        },
+
         data: function () {
             var phoneNumberData;
             if (this.mode == 'edit') {