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.
#2kdeldycke/awesome-falsehood
😱 Falsehoods Programmers Believe in
#3nylas/nylas-mail
:love_letter: An extensible desktop mail app built on the modern web. Forks welcome!
#4resend/react-email
💌 Build and send emails using React
#5mjmlio/mjml
MJML: the only framework that makes responsive-email easy
#6nodemailer/nodemailer
✉️ Send e-mails with Node.JS – easy as cake!
#7Foundry376/Mailspring
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
#8mail-in-a-box/mailinabox
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.
#9logto-io/logto
🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.
#10frappe/frappe
Low code web framework for real world applications, in Python and Javascript
#11khast3x/h8mail
Email OSINT & Password breach hunting tool, locally or using premium services. Supports chasing down related email
#12disposable-email-domains/disposable-email-domains
a list of disposable email domains
#13M66B/FairEmail
Fully featured, open source, privacy friendly email app for Android
#14usesend/useSend
Open source alternative to Resend, Sendgrid, Postmark etc.
#15onetimesecret/onetimesecret
Keep passwords and other sensitive information out of your chat logs and inboxes.
#16dovecot/core
Dovecot mail server
#17disposable/disposable-email-domains
Daily updated repository for https://github.com/disposable/disposable
#18savvyagents/larasend
Self-hosted transactional email platform — send through your own AWS SES account, keep the dashboard, API keys, delivery logs, and webhooks on your own infrastructure.
#19KatrielMoses/MailAccess
Free email OSINT tool, 2500+ platforms, identity clustering, breach detection. No API keys required. pip install mailaccess
#20Mnexa-AI/e2a
Authenticated email gateway for AI agents — SPF/DKIM verified inbound, HMAC-signed delivery, webhook + WebSocket fan-out, CLI + SDKs