var helper = require('sendgrid').mail;
        var sg = require('sendgrid')("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");

        var mail = new helper.Mail();
        var email = new helper.Email('cankoathanasios@gmail.com', 'Athanasios Canko');
        mail.setFrom(email);

        mail.setSubject('QR Code Attachment (PNG)');

        var content = new helper.Content('text/plain', 'Hello, this is a PNG version of the QR code screenshot.')
        mail.addContent(content);

        var attachment = new helper.Attachment();
        var file = fs.readFileSync(__dirname + "/screenshot.png");
        var base64File = new Buffer(file).toString('base64');
        attachment.setContent(base64File);
        attachment.setFilename('screenshot.png');
        attachment.setDisposition('attachment');
        mail.addAttachment(attachment);

        var object = [
            {email: "xxxxxxxxxxxxxxx@hotmail.com", name: "xxxxxx"},
            {email: "xxxxxxxxxxxxxxx@gmail.com", name: "xxxxxx"}
        ];

        for (var i = 0; i < object.length; i += 1) {
            var personalization = new helper.Personalization();
            email = new helper.Email(object[i].email, object[i].name);
            personalization.addTo(email);
            mail.addPersonalization(personalization);

            var request = sg.emptyRequest({
                method: 'POST',
                path: '/v3/mail/send',
                body: mail.toJSON(),
            });