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63 repositories · updated 2026-11-07
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1novuhq / novuThe open-source communication infrastructure for agents and productsTypeScriptLicense not declaredInsufficient rank history40,294
2PHPMailer / PHPMailerThe classic email sending library for PHPPHPLGPL-2.1 · Share derivative sourceInsufficient rank history22,344
3resend / react-email💌 Build and send emails using ReactTypeScriptMIT · PermissiveInsufficient rank history19,914
4mjmlio / mjmlMJML: the only framework that makes responsive email easyJavaScriptMIT · PermissiveInsufficient rank history18,286
5Foundry376 / Mailspring:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.TypeScriptGPL-3.0 · Share derivative sourceInsufficient rank history17,995
6nodemailer / nodemailer✉️ Send e-mails with Node.JS – easy as cake!TypeScriptLicense not declaredInsufficient rank history17,706
7Billionmail / BillionMailBillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZrGoAGPL-3.0 · Share derivative sourceInsufficient rank history16,201
8megadose / holeheholehe 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.PythonGPL-3.0 · Share derivative sourceInsufficient rank history15,557
9maillab / cloud-mailAn all-in-one email service platform powered by Cloudflare | One-stop email service platform based on Cloudflare | Cloudflare Email MailJavaScriptMIT · PermissiveInsufficient rank history15,471
10mail-in-a-box / mailinaboxMail-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.PythonCC0-1.0 · PermissiveInsufficient rank history15,457
11logto-io / logto🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.TypeScriptMPL-2.0 · Share derivative sourceInsufficient rank history14,851
12thunderbird / thunderbird-androidThunderbird for Android – Open Source Email App for Android (fka K-9 Mail)KotlinApache-2.0 · PermissiveInsufficient rank history14,189
13leemunroe / responsive-html-email-templateA free simple responsive HTML email templateHTMLMIT · PermissiveInsufficient rank history13,710
14OdysseusYuan / LKY_OfficeToolsOne-click automated tool for downloading, installing, and activating Office.C#GPL-3.0 · Share derivative sourceInsufficient rank history12,993
15elie222 / inbox-zeroAuthor description: The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.TypeScriptLicense not declaredInsufficient rank history12,931
16dreamhunter2333 / cloudflare_temp_emailCloudFlare free temp domain email free sending and receiving temporary domain email supports attachments IMAP SMTP TelegramBotTypeScriptMIT · PermissiveInsufficient rank history12,068
17egulias / EmailValidatorPHP Email address validatorPHPMIT · PermissiveInsufficient rank history11,638
18frappe / frappeLow code web framework for real world applications, in Python and JavascriptPythonMIT · PermissiveInsufficient rank history11,060
19Mail-0 / ZeroExperience 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/discordTypeScriptMIT · PermissiveInsufficient rank history10,881
20reacherhq / check-if-email-existsCheck if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.RustMIT · PermissiveInsufficient rank history10,429
