Node red mail usetls (#480)

* Default value for tls, checking if tls is set to false

social/email/61-email.html

@@ -49,6 +49,10 @@
         <input type="password" id="node-input-password">
     </div>
     <br/>
+    <div class="form-row">
+        <label for="node-input-useTLS"><i class="fa fa-lock"></i> <span data-i18n="email.label.useTLS"></label>
+        <input type="checkbox" id="node-input-tls" style="display:inline-block; width:20px; vertical-align:baseline;">
+    </div>
     <div class="form-row">
         <label for="node-input-dname"><i class="fa fa-tag"></i> <span data-i18n="node-red:common.label.name"></span></label>
         <input type="text" id="node-input-dname" data-i18n="[placeholder]node-red:common.label.name">
@@ -69,6 +73,7 @@
     <p>Alternatively you may provide <code>msg.attachments</code> which should contain an array of one or
     more attachments in <a href="https://www.npmjs.com/package/nodemailer#attachments" target="_new">nodemailer</a> format.</p>
     <p>If required by your recipient you may also pass in a <code>msg.envelope</code> object, typically containing extra from and to properties.</p>
+    <p>If you have own signed certificates, Nodemailer can complain about that and refuse sending the message. In this case you can try switching off TLS.</p>
     <p>Note: uses SMTP with SSL to port 465.</p>
 </script>
 
@@ -81,6 +86,7 @@
             server: {value:"smtp.gmail.com",required:true},
             port: {value:"465",required:true},
             secure: {value: true},
+            tls: {value: true},
             name: {value:""},
             dname: {value:""}
         },