Simplelogin is an email alias service, which is an invite-only service hosted by us.
We have 2 default domains, sl.projectsegfau.lt, and sl.psf.lt where the aliases can be hosted.
Additionally, users can add their own domains for use with email aliases through the WebUI.
This service is hosted on Pizza1, without a relay, so there might be some issues with email delivery (though that shouldn't really matter considering simplelogin is primarily for receiving email, not sending them).