awesome-opensource-email

AgentJ is a free software anti-spam solution with human authentication and admin panel -

Anonymous email forwarding

The Anti-Spam SMTP Proxy (ASSP).

Blackhole is an MTA written on top of asyncio, utilising async and await statements that dumps all mail it receives to /dev/null.

SMTP (email) server with a focus on simplicity, security, and ease of operation -

Transactional email server with a lovely web interface -

Django email backends and webhooks for multiple ESP -

Easy to use, yet comprehensive library for sending mails with Ballerina -

Can I email… Support tables for HTML and CSS in emails.

A few simple, but solid patterns for responsive HTML email templates and newsletters. Even in Outlook and Gmail.

List of email CSS normalise/resets.

Lint HTML emails against 250+ CSS properties across 15 email clients: compatibility scoring, dark mode simulation, accessibility and spam checks -

Collaborative messaging solution

Cypht: Lightweight Open Source webmail written in PHP and JavaScript -

Web based groupware server written in PHP -

CLI to manager email -

The mailserver suite with the 'moo' – 🐮 + 🐋 = 💕

The Roundcube Webmail suite -

A parser for SPF and DMARC DNS records -

A list of disposable/temporary email address domains -

A list of disposable email domains, cleaned and validated by scanning MX records. -

a list of disposable and temporary email address domains -

Disposable email domain lists, used in disposable email services, generated every quarter of an hour, in txt and JSON format. -

Anti-cheating, temporary (disposable/throwaway) email list -

A CLI for verifying email address deliverability over SMTP without sending an email. -

PHP Email address validator

Verify email address checking MX records, and SMTP connection, check for disposable email addresses and free email providers. -

A Go library for email verification without sending any emails. -

Downloads and flattends datas from Google Postmaster Tools (GPT)

Cross-language email validation. Backed by a database of over 55 000 throwable email domains.

Drag and drop HTML email designer -

DnD Email Editor based on React.js and MJML.

A free and open-source block-based email template builder -

A Resend Template-style WYSIWYG email editor with Notion-like editing that generates email-safe React Email templates. -

Render markdown into email-safe HTML -

Free and Open source Web Builder Framework. Next generation tool for building templates without coding

Thunderbird extension for managing emails with expiration dates -

Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is -

Keila is an Open Source alternative to newsletter tools like Mailchimp or Sendinblue.

High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.

Mailing platform with templates and logs included. -

Self hosted newsletter app

Open Source Marketing Automation Software