Nodemailer Guide: Configuration, SMTP Setup, and Email Sending

Nodemailer is a Node.js module for sending email through SMTP services, installed with npm or Yarn and configured by creating a transporter, defining message options, and calling sendMail(). The tutorial demonstrates plain-text and HTML messages, alternative content formats, multiple recipients, file and URL attachments, and embedded images referenced through content IDs. It recommends verifying SMTP credentials before sending and using built-in debug and logging settings to diagnose connection or delivery problems. For asynchronous delivery, it outlines placing email requests in RabbitMQ queues and processing them with a Nodemailer worker, while bulk sending can use pooled SMTP connections, configurable message and connection limits, local attachment paths, and an email provider designed for high-volume delivery. Mailtrap is featured throughout as an SMTP and email API provider offering testing, analytics, dedicated IP options, separate transactional and bulk streams, and large-scale bulk delivery capabilities.

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