Top MTP GitHub Repositories & Tools (2026)

Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 20 MB of RAM.

Self-hosted mail server for your own domain: SMTP/IMAP/POP3, CardDAV/CalDAV, React webmail and admin console, one-command Docker Compose.

Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)

A cross-platform .NET library for IMAP, POP3, and SMTP.

:mailbox: SMTP Server + Web Interface for viewing and testing emails during development.

An OOB interaction gathering server and client library

Emails at the heart of your business logic!

This repository holds the source code of Microsoft.Testing.Platform (MTP), a lightweight alternative to VSTest, as well as MSTest adapter and framework.

💌 Mail app for Nextcloud

Native Telegram client for Android

✉️ Open-Source Email API for Developers. Cloud & Self-hosted Alternative to SES, Mailgun, SendGrid.

Official master for the Greenmail project

A PHP library for performing email addresses validation via SMTP

Terminal-based email client for Linux and macOS

Telegram Server written in C# (Unofficial) - messaging, channels, media, secret chats and voice/video calls.

Get daily and high-speed MTProto proxy for Telegram.

qpsmtpd is a flexible smtpd daemon written in Perl

Easy-to-use asynchronous TDLib wrapper for Python.

⚡ High-capacity personal cloud storage powered by Telegram MTProto. Single static binary with Google Drive-like Web Dashboard, resumable chunked uploads, HTTP 206 video streaming, and strict ToS Safe Mode.

Open-source Telegram server implementation / MTProto server in Go for Telegram Desktop, Android, Web, bots, calls, media, and self-hosted chat experiments.