Side by side
MailStack vs UnInbox
Both stand on shared inbox software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Self-hostedWeb
MailStack offers a focused receive-only shared inbox for teams that want to host and administer their own mail setup. Its single-node deployment requirements and lack of standard outbound and mailbox protocols are important constraints to weigh.
Visit MailStack Free plan APISelf-hostedWeb
UnInbox pairs collaborative inbox features with workflow tracking and plans for individuals, teams, and larger organizations. Consider the free plan’s short raw-email retention and the added setup work for self-hosting.
Visit UnInboxThe facts
| MailStack | UnInbox | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Self-hosted, Web | API, Self-hosted, Web |
| Lowest paid plan | Free or on request | Pro: $12 per user a month |
| Plans published | 1 | 3 |
| Maker | Not published | Not published |
| Website | vib.tools | uninbox.com |
| On shared inbox software | #5 of 30 | #9 of 30 |
MailStack: what it does well
- Open-source and free under GNU AGPL version 3.0 or later
- Shared mailboxes have object-level isolation
- Includes attachment protection and authorized downloads
- Lists backup, restore, rollback, and verification tools
What to know first
- Reference deployment is single-node only
- No public SMTP submission, IMAP, or POP3
- Requires Ubuntu Server 24.04 LTS, public DNS, and inbound ports
- Excludes public registration and outbound campaigns
UnInbox: what it does well
- Shared spaces support comments and replies from shared addresses.
- Unlimited addresses are available.
- Pro includes SMTP and API access.
- Enterprise includes SAML SSO and ten-year retention.
What to know first
- Free raw email retention is 7 days.
- Enterprise requires a minimum of 30 users.
- Self-hosting requires manual email configuration.
Alternatives to MailStack Alternatives to UnInbox The whole list