Awesome
WildDuck Mail Server
<p align="center"> <a href="https://wildduck.email" target="blank"><img src="./graphics/wildduck-type.svg" width="256" alt="Wild Duck" /></a> <br /> WildDuck is a scalable no-SPOF IMAP/POP3 mail server. </p> <p align="center"> <a href="https://travis-ci.org/github/nodemailer/wildduck" target="_blank"><img src="https://img.shields.io/travis/nodemailer/wildduck" alt="build" /></a> <a href="https://david-dm.org/nodemailer/wildduck" target="_blank"><img src="https://img.shields.io/david/nodemailer/wildduck" alt="dependencies" /></a> <a href="https://david-dm.org/nodemailer/wildduck?type=dev" target="_blank"><img src="https://img.shields.io/david/dev/nodemailer/wildduck?label=devDependencies" alt="devDependencies" /></a> <a href="https://snyk.io/test/github/nodemailer/wildduck" target="_blank"><img src="https://img.shields.io/snyk/vulnerabilities/github/nodemailer/wildduck" alt="Vulnerabilities" /></a> <a href="https://hub.docker.com/r/nodemailer/wildduck" target="_blank"><img src="https://img.shields.io/docker/image-size/nodemailer/wildduck?label=docker%20image" alt="docker" /></a> <a href="https://gitter.im/nodemailer/wildduck" target="_blank"><img src="https://img.shields.io/gitter/room/nodemailer/wildduck?color=orange" alt="gitter" /></a> <a href="https://docs.wildduck.email/api/openapi.yml"><img src="https://img.shields.io/swagger/valid/3.0?specUrl=https%3A%2F%2Fdocs.wildduck.email%2Fapi%2Fopenapi.yml"></a> </p>WildDuck uses a distributed database (sharded + replicated MongoDB) as a backend for storing all data, including emails.
WildDuck tries to follow Gmail in product design. If there's a decision to be made then usually the answer is to do whatever Gmail has done.
Links
License
WildDuck Mail Agent is licensed under the European Union Public License 1.2 or later.