- chatwoot by chatwoot, 40k stars. Open source customer support inbox for live chat and email
- react-email by resend, 20k stars. Library for writing and sending emails as React components
- GHunt by mxrch, 20k stars. Python OSINT tool that pulls Google account details from an email address
- docker-mailserver by docker-mailserver, 20k stars. Container-based mail server with SMTP, IMAP, antispam and LDAP
- BillionMail by Billionmail, 16k stars. Self-hosted mail server with newsletter and email marketing tools
- holehe by megadose, 16k stars. Checks which sites an email address is registered on via password reset flows
- mailinabox by mail-in-a-box, 15k stars. Scripted one-click install of a full mail server with SMTP and webmail
- mailcow-dockerized by mailcow, 14k stars. Mail server suite in Docker
- inbox-zero by elie222, 13k stars. Open source AI email assistant for triaging and clearing an inbox
- Zero by Mail-0, 11k stars. Open source email client focused on privacy and safety
- check-if-email-exists by reacherhq, 10k stars. Checks whether an email address exists without sending mail, with an HTTP API
- tutanota by tutao, 8.2k stars. End-to-end encrypted email, contacts and calendar across all devices
- macro by macro-inc, 6.3k stars. Team workspace combining email, chat, docs, tasks, calls and CRM with AI memory
- mailflare by hieunc229, 6.3k stars. Email service for teams built on Cloudflare Workers
- sellbird by ethanplusai, 5.6k stars. Outreach agent that finds leads and writes and sends cold email
- useSend by usesend, 4.8k stars. Open source email sending platform with an SES dashboard, alternative to Resend
- aaron-marketing-skills by aaron-he-zhu, 3.1k stars. Marketing skill pack for AI agents covering SEO, social, email, paid and launch
- ram-altman by IainKay, 2.1k stars. Joke cron script that emails your unused RAM to the CEO of OpenAI
- mail by flectar, 1.9k stars. Native cross-platform mail, calendar and contacts client with low idle memory
- webmail by bulwarkmail, 1.5k stars. Web client for JMAP mail with calendar, contacts and files
- hide-my-mail-cloudflare by webmonch, 682 stars. Browser extension that creates random email aliases forwarding to your inbox
- penguin-mail by c9dev, 565 stars. Native GTK4 mail and calendar client supporting Gmail, IMAP and OpenPGP
- buzzkit by buzzkit-dev, 395 stars. Orchestrates email and push notifications behind one API
- chatgpt-creator by verssache, 347 stars. Go bot for bulk account creation with TLS spoofing and email OTP handling
- posthorn by craigmccaskill, 218 stars. Self-hosted email gateway that forwards app mail to Postmark, SES, SMTP and others
- ResolveHQ by mirza-rizvi, 213 stars. Helpdesk with shared inbox and email threading, running on Cloudflare Workers
- e2a by tokencanopy, 199 stars. Email API for apps and agents, hosted or self-hosted with Docker
- simplerelay by toinbox, 190 stars. Self-hosted SMTP relay with a web dashboard and sender access control
- notifkit by devkitshq, 176 stars. Self-hosted notification service sending email, SMS and push through one call
- taskuary by ldbumble, 150 stars. Turns mail, chats and tickets into tasks for coding agents to work on
- disposable-email-validator by wilsonadenuga, 120 stars. Validator that blocks disposable emails with per-environment rules
- docs by AurionMail, 73 stars. Documentation for a self-hostable, ProtonMail-style mail service
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