remove QMailToaster

- no updates to https://github.com/QMailToaster/ since 2016
- cannot find license

README.md

@@ -273,7 +273,6 @@ Simple deployment of a mail server, e.g. for inexperienced or impatient admins.
 - [Mailu](https://mailu.io/) - Mailu is a simple yet full-featured mail server as a set of Docker images. ([Source Code](https://github.com/Mailu/Mailu)) `MIT` `Docker/Python`
 - [Modoboa](https://modoboa.org/en/) - Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. ([Source Code](https://github.com/modoboa/modoboa)) `ISC` `Python`
 - [Ptorx](https://github.com/xyfir/ptorx) - Email privacy. Anonymously send and receive with alias forwarding. `GPL-3.0` `Nodejs`
-- [Qmailtoaster](http://www.qmailtoaster.com/) - Stable, full-featured, easy-to-install mail server based on qmail. ([Source Code](https://github.com/QMailToaster/)) `Multiple` `Linux`
 - [Simple NixOS Mailserver](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver) - Complete mailserver solution leveraging the Nix Ecosystem. `GPL-3.0` `Nix`
 - [SimpleLogin](https://simplelogin.io) - Open source email alias solution to protect your email address. Comes with browser extensions and mobile apps. ([Source Code](https://github.com/simple-login/app)) `MIT` `Docker/Python`
 - [wildduck](https://wildduck.email/) - Scalable no-SPOF IMAP/POP3 mail server. ([Source Code](https://github.com/nodemailer/wildduck)) `EUPL-1.2` `Nodejs`