mail.js

// this is a Google Apps script which fetches a random gif from Giphy and then sends it via email to people

function sendMail(){
    var url = "http://api.giphy.com/v1/gifs/random?api_key=dc6zaTOxFJmzC&tag=thanks";
    var response = UrlFetchApp.fetch(url, {}).getContentText();
    response = JSON.parse(response);
  
    var subject =  'Your friendly time tracking reminder.';
    var body = 'Please, would you track your time today? It only takes five minutes.\n\n ';
    var sender = 'Annoying Harry';
    var attachmentId = fetchImageToDrive(response.data.image_original_url)
    var file = DriveApp.getFileById(attachmentId);
  
    GmailApp.sendEmail('[email protected]', subject, body, { name: sender, attachments: [file.getAs(MimeType.GIF)] });
    GmailApp.sendEmail('[email protected]', subject, body, { name: sender, attachments: [file.getAs(MimeType.GIF)] });
    // …
  
  
  function fetchImageToDrive(imageUrl){
    var imageBlob = UrlFetchApp.fetch(imageUrl).getBlob();
    var image = DriveApp.createFile(imageBlob);
    image.setSharing(DriveApp.Access.ANYONE, DriveApp.Permission.VIEW);
    return image.getId();
  }
}