Nodemailer is the most widely used Node.js library for sending emails, with 17k+ GitHub stars and 7 million weekly npm downloads. It supports SMTP, OAuth2, HTML content, attachments, embedded images, and custom transports for services like SES and SendGrid.
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---
name: "Nodemailer Node.js Email Sending Library with SMTP and Transport Support"
slug: "nodemailer-nodejs-email-sending-library"
description: "Nodemailer is the most widely used Node.js library for sending emails, with 17k+ GitHub stars and 7 million weekly npm downloads. It supports SMTP, OAuth2, HTML content, attachments, embedded images, and custom transports for services like SES and SendGrid."
github_stars: 17534
verification: "security_reviewed"
source: "https://github.com/nodemailer/nodemailer"
author: "nodemailer"
category: "Calendar, Email & Productivity"
framework: "Multi-Framework"
tool_ecosystem:
github_repo: "nodemailer/nodemailer"
github_stars: 17534
npm_package: "nodemailer"
npm_weekly_downloads: 15495028
---
# Nodemailer Node.js Email Sending Library with SMTP and Transport Support
Nodemailer is the most widely used Node.js library for sending emails, and 7 million weekly npm downloads. It supports SMTP, OAuth2, HTML content, attachments, embedded images, and custom transports for services like SES and SendGrid.
## Installation
Requirements and caveats from upstream:
- Send emails from Node.js – easy as cake! 🍰✉️
- You are using an older Node.js version than v6.0. Upgrade Node.js to get support for the spread operator. Nodemailer supports all Node.js versions starting from Node.js@v6.0.0.
- If you are running the code on your machine, check your antivirus settings. Antiviruses often mess around with email ports usage. Node.js might not recognize the MITM cert your antivirus is using.
Basic usage or getting-started notes:
- Gmail either works well, or it does not work at all. It is probably easier to switch to an alternative service instead of fixing issues with Gmail. If Gmail does not work for you, then don't use it. Read more about it...
- host: 'smtp.example.com',
- servername: 'example.com'
- Source: https://github.com/nodemailer/nodemailer
- Extracted from upstream docs: https://raw.githubusercontent.com/nodemailer/nodemailer/HEAD/README.md
## Documentation
- https://nodemailer.com/
## Source
- [Agent Skill Exchange](https://agentskillexchange.com/skills/nodemailer-nodejs-email-sending-library/)
