Open-source alternatives to Django Mailgun

Simple e-mail sending library

Postal is an open-source email infrastructure and self-hosted delivery platform. It functions as an SMTP mail server and inbound email gateway, providing the tools necessary to send and receive email through a privately managed infrastructure. The system manages SMTP infrastructure for outgoing message delivery and provides capabilities for custom email receiving. It allows for the routing of incoming external emails to internal applications or websites for automated processing. The platform includes support for multi-tenant domain mapping, event-driven webhook notifications, and plugin-base

Mailpit is an SMTP mail testing server and web-based email inbox designed to intercept and store outgoing emails for development and integration testing without delivering them to real recipients. It functions as an SMTP mocking tool and relay gateway, allowing users to capture mail traffic and view it through a browser interface. The project distinguishes itself by providing tools for SMTP server simulation, including the ability to inject failure codes to test application resilience. It also includes an email compatibility analyzer that validates HTML rendering, checks link integrity, and s

A simple CSS parser and inliner in Go

djmail

The express way to send mail from Ruby.

Djrill: Mandrill Transactional Email for Django

Super Simple IMAP Client Library for Golang

This branch is for use with CakePHP 5.1+. For details see version map.

Golang library for providing a canonical representation of email address.

Django-SES :Info: A Django email backend for Amazon's Simple Email Service :Author: Harry Marr (http://github.com/hmarr, http://twitter.com/harrymarr) :Collaborators: Paul Craciunoiu (http://github.com/pcraciunoiu, http://twitter.com/embrangler)

Simple lib to send mail using Sendgrid in Crystal-Lang

📥 An IMAP library for Go clients and servers

✉️ A streaming Go library for the Internet Message Format and mail messages

Maddy is a modular mail server that assembles a complete email system by connecting small, single-purpose modules through a declarative configuration file. Rather than a monolithic stack, it lets operators compose message processing, storage, authentication, and security enforcement from interchangeable building blocks, with each module handling a specific function like receiving SMTP connections, verifying credentials, or applying policy checks. The server distinguishes itself through its flexible authentication and security architecture. It delegates user verification to external systems in

CSS styled emails without the hassle.

gcourier provides a simple and easy-to-use interface for sending emails from Gleam.

Lightweight SMTP client written in Go

Incoming! helps you receive email in your Rack apps.

Robust and flexible email library for Go

Django-Db-Mailer

A wrapper for ZeptoMail's transactional email API.

Email library for Crystal. Testable, adapter-based, and catches bugs for you. Comes with an adapter for SendGrid.

Using Mailchain, blockchain users can now send and receive rich-media HTML messages with attachments via a blockchain address.

Go library for the Mailgun API.