diff --git a/packages/rocketchat-i18n/i18n/en.i18n.json b/packages/rocketchat-i18n/i18n/en.i18n.json
index d8b0eab8c02..a99cdbea357 100644
--- a/packages/rocketchat-i18n/i18n/en.i18n.json
+++ b/packages/rocketchat-i18n/i18n/en.i18n.json
@@ -438,6 +438,7 @@
   "error-invalid-description": "Invalid description",
   "error-invalid-domain": "Invalid domain",
   "error-invalid-email": "Invalid email __email__",
+  "error-invalid-email-address": "Invalid email address",
   "error-invalid-file-height": "Invalid file height",
   "error-invalid-file-type": "Invalid file type",
   "error-direct-message-file-upload-not-allowed": "File sharing not allowed in direct messages",
@@ -1440,6 +1441,7 @@
   "UTF8_Names_Slugify": "UTF8 Names Slugify",
   "UTF8_Names_Validation": "UTF8 Names Validation",
   "UTF8_Names_Validation_Description": "RegExp that will be used to validate usernames and channel names",
+  "Validate_email_address": "Validate email address",
   "Verification_email_sent": "Verification email sent",
   "Verified": "Verified",
   "Version": "Version",
diff --git a/packages/rocketchat-i18n/i18n/pt.i18n.json b/packages/rocketchat-i18n/i18n/pt.i18n.json
index 697693242b1..1139213e5c1 100644
--- a/packages/rocketchat-i18n/i18n/pt.i18n.json
+++ b/packages/rocketchat-i18n/i18n/pt.i18n.json
@@ -410,6 +410,7 @@
   "error-invalid-description": "Descrição inválida",
   "error-invalid-domain": "Domínio inválido",
   "error-invalid-email": "__email__ não é um e-mail válido",
+  "error-invalid-email-address": "Endereço de e-mail inválido",
   "error-invalid-file-height": "Altura de arquivo inválida",
   "error-invalid-file-type": "Tipo de arquivo inválido",
   "error-invalid-file-width": "Altura de arquivo inválida",
@@ -1235,6 +1236,7 @@
   "UTF8_Names_Slugify": "Slugify Nomes UTF8 ",
   "UTF8_Names_Validation": "Validação de Nomes UTF8",
   "UTF8_Names_Validation_Description": "Não permitir caracteres especiais e espaços. Você pode usar - _ e. mas não no final do nome",
+  "Validate_email_address": "Validar endereço de e-mail",
   "Verification_email_sent": "E-mail de verificação enviado",
   "Verified": "Verificado",
   "Version": "Versão",
@@ -1308,4 +1310,4 @@
   "your_message_optional": "sua mensagem (opcional)",
   "Your_password_is_wrong": "Sua senha está errada!",
   "Your_push_was_sent_to_s_devices": "Sua natificação foi enviada para %s dispositivos"
-}
\ No newline at end of file
+}
diff --git a/packages/rocketchat-livechat/config.js b/packages/rocketchat-livechat/config.js
index ebe0d3ccf9f..afefc188725 100644
--- a/packages/rocketchat-livechat/config.js
+++ b/packages/rocketchat-livechat/config.js
@@ -14,6 +14,14 @@ Meteor.startup(function() {
 		i18nLabel: 'Display_offline_form'
 	});
 
+	RocketChat.settings.add('Livechat_validate_offline_email', true, {
+		type: 'boolean',
+		group: 'Livechat',
+		public: true,
+		section: 'Offline',
+		i18nLabel: 'Validate_email_address'
+	});
+
 	RocketChat.settings.add('Livechat_offline_form_unavailable', '', {
 		type: 'string',
 		group: 'Livechat',
diff --git a/packages/rocketchat-livechat/server/methods/sendOfflineMessage.js b/packages/rocketchat-livechat/server/methods/sendOfflineMessage.js
index bba6563f146..9dedcaec19a 100644
--- a/packages/rocketchat-livechat/server/methods/sendOfflineMessage.js
+++ b/packages/rocketchat-livechat/server/methods/sendOfflineMessage.js
@@ -1,4 +1,6 @@
 /* globals DDPRateLimiter */
+const dns = Npm.require('dns');
+
 Meteor.methods({
 	'livechat:sendOfflineMessage'(data) {
 		check(data, {
@@ -7,6 +9,10 @@ Meteor.methods({
 			message: String
 		});
 
+		if (!RocketChat.settings.get('Livechat_display_offline_form')) {
+			return false;
+		}
+
 		const header = RocketChat.placeholders.replace(RocketChat.settings.get('Email_Header') || '');
 		const footer = RocketChat.placeholders.replace(RocketChat.settings.get('Email_Footer') || '');
 
@@ -26,6 +32,16 @@ Meteor.methods({
 			fromEmail = RocketChat.settings.get('From_Email');
 		}
 
+		if (RocketChat.settings.get('Livechat_validate_offline_email')) {
+			const emailDomain = data.email.substr(data.email.lastIndexOf('@') + 1);
+
+			try {
+				Meteor.wrapAsync(dns.resolveMx)(emailDomain);
+			} catch (e) {
+				throw new Meteor.Error('error-invalid-email-address', 'Invalid email address', { method: 'livechat:sendOfflineMessage' });
+			}
+		}
+
 		Meteor.defer(() => {
 			Email.send({
 				to: RocketChat.settings.get('Livechat_offline_email'),