title: How to send Calendar invitation using nodemailer nodejs?
body: <p>I am sending a calendar invitation using Nodemailer. I am facing an issue that this sends me an "invite.ics" file instead for a send calendar invitation. Email sends successfully but it sends the "invite.ics" file. Can anybody help me to find out where is the issue and how can I fix this issue?
      Thanks in advance.</p>
  
  <pre><code>const ical = require('ical-generator');
  const cal = ical();
      const transporter = nodemailer.createTransport({
          service: "Gmail",
          host: 'smtp.gmail.com',
          port: 587,
          secure: false,
          auth: {
              user: 'vsvishnusingh@gmail.com',
              pass: 'mypassword',
          }
      });
          return new Promise(function(resolve,reject){
            var options = {
              start: moment(),
              end: moment().add(1, 'hour'),
              timestamp: moment(),
              summary: 'My Event',
              title : 'Annual function',
              description : 'Lets enjoy and relax',
              id : 'wdcwe76234e127eugb', 
              organiser : {'name' : 'Vishnu Singh', 'email':'vsvishnusingh@gmail.com'},
              location : 'School'
          }
  
          cal.createEvent({
              start: new Date(options.start),
              end: new Date(options.end),
              summary: options.summary || options.subject,
              description: options.description || "",
              location: options.location,
              organizer: {
                  name: options.organiser.name,
                  email: options.organiser.email
              },
              method: 'REQUEST'
          });
  
  
  
         var mailObj = {
              from: "vsvishnusingh@gmail.com",
              to: "vishnutest@gmail.com",
              subject: "Your Subject",
              text: "Some text in the body",
              alternatives: [{
                  contentType: 'text/calendar; charset=UTF-8; method=REQUEST',
                  content: new Buffer(cal.toString())
              }]
          };
  
          transporter.sendMail(mailObj, function(err, info){
             console.log(err,info);
              if (err) {
                  console.log("Error while sending email ...", err)
                  reject(err)
              } else {
                  console.log("Email send successfully!");
                  resolve()
              }
          });
  
          });
  </code></pre>