Email - Explained from First Principles: https://explained-from-first-principles.com/email/
Took me a while to read this!
076萌SNS is a social network, courtesy of 076. It runs on GNU social, version 2.0.2-beta0, available under the GNU Affero General Public License.
All 076萌SNS content and data are available under the Creative Commons Attribution 3.0 license.