MailStack

Web · Self-hosted

Visit site Alternatives

Freedom report

Two barsScore 6.3

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

MailStack is ranked #5 of 30 in shared inbox software on Freedom251. It runs on Self-hosted, Web. There is a free plan.

MailStack plans and pricing

All plans

Open source Free Self-hosted · single-node reference deployment vib.tools · 4 Oct 2026

Compared on shared inbox software

Mail platforms: standalone

Best MailStack alternatives

See all 12

Two bars Zoho TeamInbox Free tier No. 1$0.99/mo6.6 One bar Coherence Free tier No. 2$12/mo6.4 One bar Help Scout Free tier No. 3$25/mo6.4 One bar Zavu Inbox Free tier No. 4$20/mo6.4 One bar Maxdesk Free tier No. 6$20/mo6.3 One bar Sharebox Free tier No. 7$79/mo6.2

The record

Purpose: MailStack is an open-source, self-hosted mail server and shared team inbox for controlled, receive-only business email.
Inbox features: The web inbox supports search, pagination, read and unread state, attachment filters, message previews, live polling, and browser notifications.
Mailbox access: It provides administrator and ordinary-user accounts, object-level mailbox isolation, and shared mailbox memberships.
Message handling: MailStack uses Maildir ingestion with duplicate-delivery protection, malformed-message recovery, HTML sanitization, and blocking of remote and active content.
Attachments: Attachments are stored in confined protected storage and downloaded through authorized routes.
Security: Listed controls include Argon2 password hashing, login throttling, CSRF protection, secure production cookies, and least-privilege database access.
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.
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.
Operations: The project lists health and readiness endpoints, structured security audit logging, and backup, restore, rollback, and verification tooling.
Notable limits: The reference deployment excludes public user registration, outbound campaigns, multi-node or high-availability deployment, and a public administrative API.
Intended users: MailStack is designed for teams needing self-hosted business inboxes with per-user shared mailbox authorization and controlled receive-only email.
License: The source code is licensed under GNU AGPL version 3.0 or later.
Support: Vib Tools lists product support by email and provides a Bangladesh head office address in Kurigram, Rangpur.
Price from: Free

Where it ranks on Freedom251

Best Shared Inbox Software in 2026#5 of 30

Is MailStack yours?

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.

Claim it free Promote MailStack

Sources

vib.tools/product/mailstack· checked 4 Oct 2026
github.com/vibtools/MailStack· checked 4 Oct 2026
vib.tools/contact· checked 4 Oct 2026