os/hosts/flora-6/README.md

Mailman on NixOS docs

• add reverse DNS record for IP

Manual setup done for mailman, adapted from https://nixos.wiki/wiki/Mailman:

# Add DNS records in infra repo using terraform:
# https://git.pub.solar/pub-solar/infra/commit/db234cdb5b55758a3d74387ada0760e06e166b9d

# Generate initial postfix_domains.db and postfix_lmtp.db databases for Postfix
sudo -u mailman mailman aliases
# Create a django superuser account
sudo -u mailman-web mailman-web createsuperuser
# Followed outlined steps in web UI