Mail-in-a-Box vs mailcow (2026): which should you pick?
As of Nov 13, 2026, mailcow grades higher than Mail-in-a-Box: 2.4 against 2.0 out of 4.0.
Checked Nov 13, 2026 · graded Nov 13, 2026 by ToolGPA
mailcow grades higher on the free plan and platforms. They get the same grade on value for money, features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Mail-in-a-Box
Free script that turns a cloud server into your own mail server
Free
Which one is for you
Pick Mail-in-a-Box if
- Fits if you want your own mail on your own domain and can run a server
- Works for people who would rather run one script than configure ten programs
Look elsewhere if
- Skip it if you want a home connection to do it, since it needs a cloud server with a clean IP
- Skip it if you don't want to be the sysadmin
- Watch out: the page warns that other mail services may block or filter mail from your own server
- Watch out: it needs a dedicated fresh machine, and manual changes after install are overwritten
Pick mailcow if
- Fits if you want to run your own mail for a domain or two and know Docker
- Works for admins who want webmail and calendars from one install
Look elsewhere if
- Skip it if you don't want to look after a server
- Skip it if you want guaranteed help, as support is community best-effort
- Watch out: the key pair for stored mail sits in a Docker volume you must back up
- Watch out: managed mailcow comes from Servercow, whose prices we did not read
How we grade them
| 2.0GPAMail-in-a-BoxFair | 2.4GPAmailcowFair | |
|---|---|---|
| Value for money | CThe software is free, but the guide puts a server at about $12 a month plus a domain at about $17 a year, which lands in the dearer end of the category. | CFree software, but you rent and run the server, so it's a C by our rule. |
| Free plan and trial | CFree software that still needs a rented server running before anything works. | BThe software is free with nothing held back. Paid support is a separate subscription from Servercow. |
| Features | BMail server, webmail, automatic DNS and security records, spam filtering, backups, multiple users and domains. The listing shows no gap in the core job. | BA full mail stack with web admin, SOGo webmail, groups, shared resources, two-factor sign-in and mailbox migration. The listing shows no gap in the job. |
| Ease of use | DYou install it on a fresh machine and act as the sysadmin, with help from a forum and chat room. | DYou run Docker, DNS records, TLS and backups of the volumes yourself. |
| Platforms and integrations | CA web admin and webmail, with Roundcube, Nextcloud and Let's Encrypt. No apps of its own. | BA web admin and webmail, with Outlook, Thunderbird, Keycloak, Nextcloud and Roundcube connections. No apps of its own. |
| Best for | one script that makes a cloud server a mail server | a mail server in Docker |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Mail-in-a-Box and mailcow. How we grade
Price against what you get
Mail-in-a-Box has no paid plan and scores 2.0 out of 4 on features, ease of use and platforms. mailcow has no paid plan and scores 2.3.
mailcow scores higher for the same starting price. Of the other email apps on the chart, none scores higher than Mail-in-a-Box for less, and none scores higher than mailcow for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
In commonFree planWebOpen sourceSelf-hostableCalendarEmail client
At a glance
| Mail-in-a-Box | mailcow | |
|---|---|---|
| Pricing | Free | Free |
| Starts at | Free | Free |
| Free plan | The software is free; you pay for your own server and domain, which the setup guide puts at about $12 a month plus roughly $17 a year. | The software is free to run on your own server, with best-effort community support. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Mail-in-a-Box project | The Infrastructure Company GmbH |
| Price read from | mailinabox.email | docs.mailcow.email |
| Checked | Nov 13, 2026 | Nov 13, 2026 |
Worth knowing
Mail-in-a-Box
- It cannot run on a home connection: it needs a cloud server with a clean IP, so the guide advises renting a virtual machine.
- It must be installed on a fresh machine dedicated to it, and manual changes after install are overwritten.
- The page warns that other mail services may block or spam-filter mail sent from your own server.
- You act as the system administrator and must fix issues yourself; help comes from a forum and chat room.
mailcow
- You run the server yourself: DNS records, TLS, backups of the Docker volumes and updates are yours to manage.
- Official support is community-driven and best-effort; paid support is a separate subscription sold by Servercow.
- Stored mail is compressed and encrypted, and the key pair sits in a Docker volume that must be backed up.
- A managed mailcow is sold by Servercow, whose pages are in German and whose prices were not read here.
Key features
Mail-in-a-Box
- Webmail and mail server in one
- Includes Roundcube webmail and an IMAP and SMTP server for phones and desktop mail apps, with contacts and calendar sync.
- Automatic DNS and security records
- When the box acts as your nameserver it sets SPF, DKIM, DMARC and MTA-STS records, and can add DNSSEC with DANE.
- Control panel and API
- A web panel to add mail accounts, aliases and custom DNS records, run status checks and set up backups, also reachable over a REST API.
- Spam filtering and backups
- Spam filtering with greylisting, mail filter rules, TLS certificates from Let's Encrypt and automated backups to Amazon S3 and similar services.
- Multiple users and domains
- One box can host mail for several users and domain names, with simple static website hosting on the side.
mailcow
- Complete mail stack in containers
- Postfix, Dovecot, Rspamd spam filtering, optional ClamAV scanning, an Unbound resolver and automatic Let's Encrypt certificates.
- Web admin interface
- Create domains and mailboxes, manage aliases, DKIM and ARC keys, allow and block lists, quarantine and per-user spam scores.
- SOGo webmail and sync
- SOGo provides the webmailer plus CalDAV and CardDAV, with ActiveSync device support.
- Groups and shared resources
- Groups with distribution lists, send-as permissions, shared mailboxes and shared calendars.
- Sign-in and two-factor options
- Login through Keycloak, LDAP or Active Directory, or OIDC, plus TOTP, Yubikey OTP and WebAuthn.
- Mailbox migration
- Built-in imapsync jobs pull or migrate mail from remote mailboxes, including Microsoft 365 and Google over OAuth2.
Plans
Mail-in-a-Box
Mail-in-a-Box$0
Free software. The setup guide estimates about $12 a month for the cloud server, plus a domain name at about $17 a year.
mailcow
mailcow: dockerized$0
Free open-source software you host yourself; community support is voluntary and carries no guarantee.
Common questions
Which is cheaper, Mail-in-a-Box or mailcow?
As of Nov 13, 2026, both Mail-in-a-Box and mailcow are free to use.
Which has a free plan, Mail-in-a-Box or mailcow?
As of Nov 13, 2026, both Mail-in-a-Box and mailcow have a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.