Best Open Source email Libraries

A curated list of the most popular GitHub repositories tagged with email. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.

#1novuhq/novu

The open-source notification Inbox infrastructure. E-mail, SMS, Push and Slack Integrations.

38,597TypeScript

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#2kdeldycke/awesome-falsehood

😱 Falsehoods Programmers Believe in

27,067

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#3nylas/nylas-mail

:love_letter: An extensible desktop mail app built on the modern web. Forks welcome!

24,798JavaScript

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#4PHPMailer/PHPMailer

The classic email sending library for PHP

22,028PHP

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#5resend/react-email

💌 Build and send emails using React

18,091TypeScript

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#6mjmlio/mjml

MJML: the only framework that makes responsive-email easy

17,893JavaScript

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#7nodemailer/nodemailer

✉️ Send e-mails with Node.JS – easy as cake!

17,473JavaScript

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#8leemunroe/responsive-html-email-template

A free simple responsive HTML email template

13,692HTML

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#9Billionmail/BillionMail

BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr

13,543Go

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#10thunderbird/thunderbird-android

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

13,133Kotlin

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#11frappe/frappe

Low code web framework for real world applications, in Python and Javascript

9,708Python

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#12swiftmailer/swiftmailer

Comprehensive mailing tools for PHP

9,472PHP

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#13jstedfast/MailKit

A cross-platform .NET library for IMAP, POP3, and SMTP.

6,729C#

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