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novuhq /novu

Star37.3k

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

notifications react nodejs javascript alternative inbox typescript communication reactjs email sms push-notifications transactional notification-center hacktoberfest novu

UpdatedJul 18, 2025
TypeScript

kdeldycke /awesome-falsehood

Sponsor

Star25.9k

😱 Falsehoods Programmers Believe in

engineering identity time awesome programming internationalization date email phone-number network typography resources awesome-list geography falsehoods postal-addresses edge-cases phone-numbers myths

UpdatedJul 17, 2025

nylas /nylas-mail

Star24.8k

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

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UpdatedNov 24, 2022
JavaScript

PHPMailer /PHPMailer

Star21.6k

The classic email sending library for PHP

php email php-library attachment smtp phpmailer hacktoberfest tls-support xoauth2

UpdatedJun 20, 2025
PHP

mjmlio /mjml

Star17.5k

MJML: the only framework that makes responsive-email easy

responsive email email-boilerplate email-campaigns mjml responsive-email

UpdatedJun 24, 2025
JavaScript

nodemailer /nodemailer

Star17.1k

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

email email-sender nodemailer rfc822

UpdatedJul 7, 2025
JavaScript

Foundry376 /Mailspring

Star16.5k

💌 A beautiful, fast and fully open source mail client for Mac, Windows and Linux.

electron windows linux mail osx email imap electron-app

UpdatedJul 16, 2025
JavaScript

mail-in-a-box /mailinabox

Star14.7k

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

mail server email smtp

UpdatedJul 11, 2025
Python

leemunroe /responsive-html-email-template

Star13.6k

A free simple responsive HTML email template

html responsive email email-marketing html-emails email-template email-templates

UpdatedAug 20, 2024
HTML

thunderbird /thunderbird-android

Star12.2k

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

android communication email mozilla

UpdatedJul 18, 2025
Kotlin

egulias /EmailValidator

Sponsor

Star11.6k

PHP Email address validator

php email validator emailvalidator

UpdatedMar 20, 2025
PHP

logto-io /logto

Sponsor

Star10.5k

🧑‍🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.

identity jwt saml oauth2 typescript signup authentication login email sms password authorization totp rbac sso openid-connect social-login mfa passwordless logto

UpdatedJul 18, 2025
TypeScript

OdysseusYuan /LKY_OfficeTools

Star10.3k

一键自动化下载、安装、激活 Office 的利器。

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UpdatedFeb 22, 2024
C#

swiftmailer /swiftmailer

Star9.5k

Comprehensive mailing tools for PHP

php email mailer emails

UpdatedOct 25, 2021
PHP

megadose /holehe

Star9.1k

holehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function.

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UpdatedSep 10, 2024
Python

Mail-0 /Zero

Star8.9k

Experience email the way you want with Mail0 – the first open source email app that puts your privacy and safety first. Join the discord:https://mail0.link/discord

security privacy ai email