jstedfast / MailKit

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

UnigramDev / Unigram

Telegram for Windows

rnwood / smtp4dev

smtp4dev - the fake smtp email server for development and testing

ChangemakerStudios / Papercut-SMTP

Papercut SMTP -- The Simple Desktop Email Server

wiz0u / WTelegramClient

Telegram Client API (MTProto) library written 100% in C# and .NET

microsoft / testfx

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