mailbox
mailbox: A flexible secure email service with low-cost annual plans and broad client support. Ranked #6 of 28 in Secure Email Providers by our editors (8.2/10); pricing: 30-day trial; best for low-cost secure hosting with client flexibility.
At a glance
- Editor score8.2 / 10
- Pricing30-day trial
- Best forLow-cost secure hosting with client flexibility
- Free planNo
- Paid from€1/mo
- End-to-end encryptionYes
- Founded2014 · Berlin, Germany
- Facts checked15 Sep 2026
Where it wins
- Optional PGP and S/MIME encryption with spam and virus protection
- IMAP, POP3, SMTP, CalDAV and CardDAV support
- Six-platform coverage with custom domains on paid tiers
Where it doesn't
- No free plan is available
- Light has 2 GB storage and three @mailbox.org aliases
- Annual Light billing requires a €12 minimum deposit
Our verdict on mailbox
mailbox is a Germany-hosted email and collaboration service for private individuals, families, businesses, and public-sector organizations. It combines webmail with PGP and S/MIME encryption, spam and malware filtering, aliases, calendars, contacts, tasks, and access through common mail protocols. The service is operated by Heinlein Hosting GmbH, with data stored in Berlin-based data centers. Its six-platform coverage includes web, Windows, macOS, Linux, iOS, and Android, making it suitable for people who want secure hosting without being tied to one mail application.
Pricing is structured around three tiers. Light costs €1 per month with annual billing, includes 2 GB of mailbox storage, three @mailbox.org aliases, a calendar and address book, and IMAP and POP3 access; annual payment requires a €12 minimum deposit. Standard costs €4 per month monthly or €3 per month annually, adding 20 GB of storage, 25 @mailbox.org aliases, 50 custom-domain aliases, 10 GB of Drive storage, Office, and Meet. Premium costs €12 monthly or €9 per month annually, with 50 GB of mailbox storage, 250 custom-domain aliases, and 100 GB of Drive storage. A 30-day trial is available, but there is no free plan.
The main advantage is client flexibility: mailbox supports IMAP, POP3, SMTP, CalDAV, CardDAV, Exchange ActiveSync, Thunderbird, Outlook, Apple Mail, and DAVx⁵. Optional PGP and S/MIME encryption, two-factor authentication, disposable addresses, and synchronization add useful control for security-conscious users. Custom-domain email is reserved for Standard and Premium, while Light is aimed at basic personal use. Choose mailbox if you want low-cost secure hosting, established protocol support, and optional productivity services. Consider another provider if you need a free tier or custom-domain email at the entry level.
Your product? Our editors can test mailbox in depth and publish a review, labelled as paid · from $149/mo →
mailbox pricing
All 3 mailbox plans and prices →
mailbox fact sheet
| Free plan | No |
|---|---|
| Paid from | €1/mo |
| End-to-end encryption | Yes |
| Custom domain | Yes |
| Mailbox storage | 2 GB |
| Email aliases | 3 aliases |
| Encrypted calendar | Not verified |
| Mail protocol support | Imap_smtp |
| Free trial | 30 days |
| Deployment | Cloud, Desktop, Mobile |
| Platforms | Web, Windows, macOS, Linux, iOS, Android |
| Integrations | 10 integrations: IMAP, POP3, SMTP, CalDAV, CardDAV, Exchange ActiveSync … |
| Pricing | 30-day trial (source) |
| Website | mailbox.org |
| Facts checked | 15 Sep 2026 |
mailbox integrations
mailbox lists 10 integrations on its own site.
- IMAP
- POP3
- SMTP
- CalDAV
- CardDAV
- Exchange ActiveSync
- Thunderbird
- Outlook
- Apple Mail
- DAVx⁵
Alternatives to mailbox
- Proton MailA complete secure email suite with a capable free plan and wide platform coverage.9.4
- Tuta MailA privacy-focused email service with strong encryption and open-source apps.9.2
- Aster MailA low-cost secure email service with encryption, aliases, domains, and broad device support.8.9
See all mailbox alternatives →
mailbox vs the competition
- mailbox vs Proton Mail
- mailbox vs Tuta Mail
- mailbox vs Aster Mail
- mailbox vs Mailfence
- mailbox vs eclipso Mail Europe
- mailbox vs Runbox
Compare mailbox with any tool side by side →
Also Ranked In
mailbox is ranked in 5 of our directories.
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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used mailbox for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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