Mail-in-a-Box
Mail-in-a-Box: A broad, open-source email stack for Linux users prepared to manage their own server. Ranked #78 of 178 in Email Hosting by our editors (5.3/10); pricing: Free plan; best for linux users wanting automated self-hosted email.
At a glance
- Editor score5.3 / 10
- PricingFree plan
- Best forLinux users wanting automated self-hosted email
- Free planYes
- Paid fromFree
- Founded2013
- Facts checked23 Sep 2026
Where it wins
- Includes webmail, IMAP/SMTP, calendar, contacts, aliases, and filtering
- Automates DNS security records, TLS certificates, and backups
- Provides a web control panel and RESTful HTTP API
Where it doesn't
- Requires a fresh Ubuntu cloud server and self-hosting responsibility
- No verified migration tools are listed
- Mobile access relies on third-party apps
Our verdict on Mail-in-a-Box
Mail-in-a-Box is open-source, self-hosted software that turns a fresh Ubuntu cloud server into a mail server. It is intended for individuals and organizations that want to operate their own email service rather than rely on a hosted mailbox provider. The package supports multiple users and domains, with Roundcube webmail, IMAP and SMTP access, contacts and calendar synchronization, mail accounts and aliases, and a web-based administrative control panel. It is distributed under the CC0 public-domain dedication.
The feature set covers more than mailbox delivery. Spam filtering, greylisting, mail filter rules, automatic DNS configuration for email security records, and automatic Let’s Encrypt TLS certificates are included. Backups can be automated to Amazon S3 and compatible services, while the RESTful HTTP API adds a programmatic administration path. Its ecosystem fit is centered on Linux and web administration, with integrations including Roundcube, Nextcloud, Amazon S3, and Let’s Encrypt. Calendar support is included, and mobile access is handled through third-party apps.
The main trade-off is operational ownership. Mail-in-a-Box requires a fresh Ubuntu cloud server, so the organization choosing it also takes responsibility for self-hosting the email service and its surrounding infrastructure. The published product details do not include verified migration tools, which makes transition planning an important consideration for existing mail systems. Choose Mail-in-a-Box if Linux-based self-hosting, open-source distribution, automated email security configuration, and control over users and domains are priorities. A hosted email service or another migration-focused platform is a better fit for teams that want provider-managed infrastructure or a defined migration workflow.
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Mail-in-a-Box pricing
Mail-in-a-Box fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Storage per mailbox | Not verified |
| Email aliases | Not verified |
| Attachment limit | Not verified |
| IMAP/POP support | Yes |
| Mobile app access | Third_party |
| Calendar included | Yes |
| Migration tools | Not verified |
| Deployment | Cloud, Self-hosted, Browser extension |
| Platforms | Web, Linux |
| Compliance & security | 2FA |
| Support | Community |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 1 integrations: Amazon S3 |
| Pricing | Free plan |
| Website | mailinabox.email |
| Facts checked | 23 Sep 2026 |
Mail-in-a-Box integrations
Mail-in-a-Box lists 1 integrations on its own site.
- Amazon S3
Alternatives to Mail-in-a-Box
- Zoho MailA flexible business email suite with a free plan, low-cost entry tier, and migration support.9.4
- Microsoft Exchange OnlineA deep Exchange service for organizations centered on Outlook and administration.9.2
- Google WorkspaceA full Gmail-based collaboration suite for organizations that need more than email.9.1
See all Mail-in-a-Box alternatives →
Also Ranked In
Mail-in-a-Box is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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