Fixes MAIL_URL setting

packages/rocketchat-lib/settings/server/startup.coffee

@@ -46,6 +46,6 @@ Meteor.startup ->
 	RocketChat.settings.add 'Layout_Home_Body', 'Welcome to Rocket.Chat <br> Go to APP SETTINGS -> Layout to customize this intro.', { type: 'string', multiline: true, group: 'Layout', public: true  }
 
 	if process?.env? and not process.env['MAIL_URL']? and RocketChat.settings.get('SMTP_Host') and RocketChat.settings.get('SMTP_Username') and RocketChat.settings.get('SMTP_Password')
-		process.env['MAIL_URL'] = encodeURIComponent(RocketChat.settings.get('SMTP_Username')) + ':' + encodeURIComponent(RocketChat.settings.get('SMTP_Password')) + '@' + encodeURIComponent(RocketChat.settings.get('SMTP_Host'))
+		process.env['MAIL_URL'] = "smtp://" + encodeURIComponent(RocketChat.settings.get('SMTP_Username')) + ':' + encodeURIComponent(RocketChat.settings.get('SMTP_Password')) + '@' + encodeURIComponent(RocketChat.settings.get('SMTP_Host'))
 		if RocketChat.settings.get('SMTP_Port')
 			process.env['MAIL_URL'] += ':' + parseInt(RocketChat.settings.get('SMTP_Port'))