add envelope to email node options

as part of node-red#875

social/email/61-email.html

@@ -77,6 +77,7 @@
     The filename should be set using <code>msg.filename</code>. Optionally <code>msg.description</code> can be added for the body text.</p>
     <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>Note: uses SMTP with SSL to port 465.</p>
 </script>
 

social/email/61-email.js

@@ -89,6 +89,7 @@ module.exports = function(RED) {
                     var sendopts = { from: node.userid };   // sender address
                     sendopts.to = node.name || msg.to; // comma separated list of addressees
                     sendopts.subject = msg.topic || msg.title || "Message from Node-RED"; // subject line
+                    if (msg.hasOwnProperty("envelope")) { sendopts.envelope = msg.envelope; }
                     if (Buffer.isBuffer(msg.payload)) { // if it's a buffer in the payload then auto create an attachment instead
                         if (!msg.filename) {
                             var fe = "bin";

social/email/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-email",
-    "version"       : "0.1.5",
+    "version"       : "0.1.6",
     "description"   : "Node-RED nodes to send and receive simple emails",
     "dependencies"  : {
         "nodemailer"   : "1.11.*",