mailbox.org

mailbox.org

mailbox
+
+

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About

SuperMailOS is managed business email on your own domain for small teams. You bring your domain; SuperMailOS runs the mail server and handles deliverability — SPF, DKIM, DMARC, IP reputation, and warmup — so your email lands in the inbox, not the spam folder. Setup takes minutes: verify your domain with one-click DNS on Cloudflare, DigitalOcean, and other providers (or guided copy-paste on any registrar), invite your team, and start sending. Every person gets a real mailbox; aliases like hello@ and support@ are unlimited and free. Webmail is as simple as Gmail — threads, instant search, keyboard shortcuts, labels, dark mode — plus IMAP and SMTP for any mail app, and a live deliverability dashboard showing your mail landing. Flat pricing per mailbox: Pro $3/mailbox/month annually (10 GB, 3 domains), Business $5 (30 GB, unlimited domains), custom at 50+. 14-day free trial, no credit card.

About

mailbox is the digital workplace that offers highest data protection and security standards. We deliver digital sovereignty from Germany for the world. Our mailbox Suite brings together email, calendar, contacts, office, video conferencing and drive in one intuitive solution – running exclusively from German data centres. As a European provider, we completely reject tracking and data monetisation. We put our customers' business interests first, providing genuine digital independence without compromising on functionality or efficiency. mailbox serves businesses, public and educational institutions, resellers and private individuals who value security, compliance, data protection and intuitive usability. We're part of the Heinlein Group, which has been the expert in free and secure communication for over 30 years.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Supported
Android Supported
Chromebook Not Supported

Audience

Small and medium businesses, startups, agencies, and freelancers who want professional email on their own domain without running a mail server or managing DNS and deliverability themselves.

Audience

Businesses, public and educational institutions, resellers and private individuals who value security, compliance, data protection and intuitive usability.

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Supported
24/7 Live Support Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$3/month per mailbox
Free Version Not Supported
Free Trial Supported

Pricing

No information available.
Free Version Not Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

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Reviews/Ratings

Overall 2.5 / 5
ease 3.5 / 5
features 3.5 / 5
design 3.5 / 5
support 2.5 / 5

Pros & Cons from Real Users

Pros

  • Price is competitive and the help articles are comprehensive. The system is simple to navigate. The process of adding an alias domain is straight forward and simple (similar to other providers).
  • Mailbox.org is a reliable, feature packed service that provides secure and private email with solid encryption, cloud storage, an office suite and video conferencing on a 100% eco-friendly platform with servers based in Germany.

Cons

  • Mailbox.org claims custom domains are supported. They require you to send/receive emails for custom domains using an alias. After successfully altering your DNS records and adding an alias within their system, you will NEVER be able to send or receive emails via that alias. So, while they allow you to add an alias, it will always be nonfunctional. They offer no way to send emails from that alias. This feels very deceptive, as you must subscribe to their service to discover that you cannot send emails from your own custom domain (as it's not even offered on the free tier). I feel ripped off. There is no tech support or help available, but this does not appear to be a tech issue. This appears to be working as designed (e.g. it is not designed to work).
  • Mailbox.org does not have a native mobile app although, from your phone's web browser, you can add mailbox.org to your Android or iPhone home screen for quick, app-like access. The user interface is functional though rather bland and navigating preferences and settings can be a bit of a challenge until you're familiar with it.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

SuperMailOS
Founded: 2026
supermailos.com

Company Information

mailbox
Founded: 2014
Germany
mailbox.org/en/

Alternatives

Alternatives

Categories

Email Hosting Supported

Categories

Email Hosting Supported
Email Management Supported

Integrations

Boxcryptor Not Supported
Franz Not Supported
MailRoute Not Supported
Stackreaction Not Supported
TIMi Not Supported

Integrations

Boxcryptor Supported
Franz Supported
MailRoute Supported
Stackreaction Supported
TIMi Supported
Claim SuperMailOS and update features and information
Claim SuperMailOS and update features and information
Claim mailbox.org and update features and information
Claim mailbox.org and update features and information