ERROR ===  { Error: Invalid sender “<Myemailaddress@gmail.com>”
2016-08-15T05:05:01.034175+00:00 app[web.1]:     at SMTPConnection._formatError (/app/node_modules/smtp-connection/lib/smtp-connection.js:493:15)
2016-08-15T05:05:01.034175+00:00 app[web.1]:     at SMTPConnection._setEnvelope (/app/node_modules/smtp-connection/lib/smtp-connection.js:688:30)
2016-08-15T05:05:01.034176+00:00 app[web.1]:     at SMTPConnection.send (/app/node_modules/smtp-connection/lib/smtp-connection.js:364:10)
2016-08-15T05:05:01.034177+00:00 app[web.1]:     at SMTPTransport.<anonymous> (/app/node_modules/nodemailer-smtp-transport/lib/smtp-transport.js:126:24)
2016-08-15T05:05:01.034178+00:00 app[web.1]:     at /app/node_modules/nodemailer-smtp-transport/lib/smtp-transport.js:162:21
2016-08-15T05:05:01.034178+00:00 app[web.1]:     at SMTPConnection._actionAUTHComplete (/app/node_modules/smtp-connection/lib/smtp-connection.js:1185:5)
2016-08-15T05:05:01.034179+00:00 app[web.1]:     at SMTPConnection.<anonymous> (/app/node_modules/smtp-connection/lib/smtp-connection.js:307:22)
2016-08-15T05:05:01.034180+00:00 app[web.1]:     at SMTPConnection._processResponse (/app/node_modules/smtp-connection/lib/smtp-connection.js:634:16)
2016-08-15T05:05:01.034180+00:00 app[web.1]:     at SMTPConnection._onData (/app/node_modules/smtp-connection/lib/smtp-connection.js:458:10)



var nodemailer = require('nodemailer');
var transporter = nodemailer.createTransport({
  service: 'Mailgun',
  auth: {
    user: process.env.MAILGUN_USERNAME,
    pass: process.env.MAILGUN_PASSWORD
  }
});

/**
 *
 */
exports.contact = function(from, to) {

  var mailOptions = {
    from: from.name + ' ' + '<'+ from.email + '>',
    to: to.email,
    subject: from.subject || "No Subject",
    text: from.message
  };

  transporter.sendMail(mailOptions, function(err) {
    if (err){
      console.log("ERROR === ", err);
    }
  });
};

var mailOptions = {
    from: from.email
    to: to.email,
    subject: from.subject || "No Subject",
    text: from.message
  };

Nodemailer does not support proxies and currently there is no plan to add any support for these, sorry.