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Nodemailer with Gmail and NodeJS: A Comprehensive Tutorial

This tutorial will guide you through setting up Nodemailer with Gmail in a NodeJS application. We'll cover everything from setting up your Gmail account for less secure app access (and explore more secure alternatives like OAuth2), installing Nodemailer, creating a simple mailer module, and sending basic and advanced emails.

*Prerequisites:*

*NodeJS installed:* You can download and install NodeJS from [https://nodejs.org/](https://nodejs.org/)
*NPM or Yarn:* These come bundled with NodeJS and are package managers.
*Gmail account:* You'll need a Gmail account to send emails. *Important: Using your primary Gmail account for this is generally discouraged, especially for production. Consider creating a separate dedicated "app email" Gmail account for testing and development.*

*Outline:*

1. *Setting up Gmail (Less Secure App Access - *Discouraged*)*
2. *Setting up Gmail (OAuth2 - *Recommended*)*
3. *Project Setup*
4. *Installing Nodemailer*
5. *Creating a Mailer Module*
6. *Sending a Simple Email*
7. *Sending Emails with HTML Content*
8. *Sending Emails with Attachments*
9. *Sending Emails with Embedded Images*
10. *Handling Errors and Status Codes*
11. *Best Practices and Security Considerations*
12. *Alternative Email Transports (Beyond Gmail)*

*1. Setting up Gmail (Less Secure App Access - *Discouraged*):*

**WARNING: This method is strongly discouraged for production applications because it weakens your account security. Google is actively phasing this out and you might eventually be forced to use OAuth2. Use this *only for quick testing and then migrate to OAuth2.***

*Enable "Less Secure App Access":* Log into your Google account. Go to your Google account security settings ([https://myaccount.google.com/security](https://myaccount.google.com/security)). Scroll down to the "Less secure app access" section and turn it **ON**.
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