Sending Bulk Emails 3 Ways With Twilio SendGrid And Node.js` discusses three methods to send bulk emails using Node.js and SendGrid: sending multiple emails to a single recipient, personalizing emails with attributes such as subject lines, headers, substitutions, custom arguments, and send times; and sending an array of message objects to different recipients. The article provides code examples for each method, including how to set up the environment, create API keys, and handle errors. It also discusses the current API rate limit and offers tips for customizing emails. The SendGrid API is highlighted as a flexible and feature-rich tool for sending bulk emails.