Merge pull request #1495 from ardichoke/patch-1

Update NixOS Mailserver Link

README.md

@@ -304,7 +304,7 @@ _Simple deployment of a mail server, e.g. for inexperienced or impatient admins.
 - [Mail-in-a-Box](https://mailinabox.email/) - Turns any Ubuntu server into a fully functional mail server with one command. ([Source Code](https://github.com/mail-in-a-box/mailinabox)) `CC0-1.0` `Shell`
 - [Modoboa](http://modoboa.org/en/) - Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. ([Source Code](https://github.com/tonioo/modoboa)) `MIT` `Python`
 - [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://github.com/r-raymond/nixos-mailserver) - A complete mailserver solution leveraging the Nix Ecosystem. `GPL-3.0` `Nix`
+- [Simple NixOS Mailserver](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver) - A complete mailserver solution leveraging the Nix Ecosystem. `GPL-3.0` `Nix`
 
 #### Mail Transfer Agents