MailStack

Spec sheet

Purpose

MailStack is an open-source, self-hosted mail server and shared team inbox for controlled, receive-only business email.Read 4 Oct 2026 · vib.tools

Intended users

MailStack is designed for teams needing self-hosted business inboxes with per-user shared mailbox authorization and controlled receive-only email.Read 4 Oct 2026 · vib.tools

Security

Listed controls include Argon2 password hashing, login throttling, CSRF protection, secure production cookies, and least-privilege database access.Read 4 Oct 2026 · vib.tools

Support

Vib Tools lists product support by email and provides a Bangladesh head office address in Kurigram, Rangpur.Read 4 Oct 2026 · vib.tools

License

The source code is licensed under GNU AGPL version 3.0 or later.Read 4 Oct 2026 · github.com

Attachments

Attachments are stored in confined protected storage and downloaded through authorized routes.Read 4 Oct 2026 · vib.tools

Deployment requirements

The supported reference deployment is a single-node Ubuntu Server 24.04 LTS VPS with public DNS and reachable inbound ports 25, 80, and 443.Read 4 Oct 2026 · vib.tools

Inbox features

The web inbox supports search, pagination, read and unread state, attachment filters, message previews, live polling, and browser notifications.Read 4 Oct 2026 · vib.tools

Mail flow

The reference deployment receives mail via Postfix and delivers it through Dovecot LMTP; it excludes public SMTP submission, IMAP, POP3, and open relay.Read 4 Oct 2026 · vib.tools

Mailbox access

It provides administrator and ordinary-user accounts, object-level mailbox isolation, and shared mailbox memberships.Read 4 Oct 2026 · vib.tools

Message handling

MailStack uses Maildir ingestion with duplicate-delivery protection, malformed-message recovery, HTML sanitization, and blocking of remote and active content.Read 4 Oct 2026 · vib.tools

Notable limits

The reference deployment excludes public user registration, outbound campaigns, multi-node or high-availability deployment, and a public administrative API.Read 4 Oct 2026 · vib.tools

Operations

The project lists health and readiness endpoints, structured security audit logging, and backup, restore, rollback, and verification tooling.Read 4 Oct 2026 · vib.tools

Plans and prices

Every MailStack plan and price →

Where Specifiction places it

• Shared Inbox Software#22 of 307.6