Postorius is the Mailman 3 web UI for list administration, integrated with HyperKitty and core Mailman services. Security depends on Django auth hardening and strict mailing-list role controls.
¶ 1) Harden list-admin authentication and RBAC
- Enforce strong authentication for list owners and site admins.
- Integrate SSO and MFA through Django/auth gateway where possible.
- Restrict who can create/delete lists and alter moderation policies.
- Audit permission changes for list owners and moderators.
- Keep Mailman core and DB services on private networks.
- Expose Postorius only through HTTPS reverse proxy.
- Protect REST API endpoints and rotate API credentials.
- Limit admin interface access by network policy.
¶ 3) Protect list data and archives
- Restrict archive visibility for private lists.
- Encrypt backups that include subscriber and archive metadata.
- Monitor moderation queues and anomalous posting behavior.
- Keep Postorius/Mailman 3 components updated together.
- Mailman 3 documentation: https://docs.mailman3.org/
- Postorius source repository: https://gitlab.com/mailman/postorius
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