Mailum
Mailum: A focused encrypted mailbox for individuals who prioritize private email metadata and storage. Ranked #36 of 41 in Encrypted Email Services by our editors (4.4/10); pricing: Free plan; best for minimal encrypted mailbox service.
At a glance
- Editor score4.4 / 10
- PricingFree plan
- Best forMinimal encrypted mailbox service
- Free planYes
- Zero-access storageYes
- Facts checked20 Sep 2026
Where it wins
- Encrypts email content, subjects, participants, and metadata
- Uses zero-access encryption for stored mailbox data
- Offers web access and an official Android email application
Where it doesn't
- Focused platform coverage: web and Android
- Feature scope centers on encrypted email and mailbox privacy
- Not positioned as a broad collaboration or integration suite
Our verdict on Mailum
Mailum is a privacy-focused email service for individuals who want encrypted communications and reduced provider access to mailbox data. Its core offering combines a browser-based private mailbox with an official Android application. The service emphasizes end-to-end encryption for email communications, alongside encryption for message subjects, sender and recipient details, and other metadata. Zero-access encryption is also applied to stored mailbox data, making private email handling the central reason to consider Mailum.
Mailum follows a freemium model, with free accounts and paid plans available. The published offering is centered on mailbox privacy rather than a broad ecosystem of applications or integrations. Access is provided through the web and Android, so the product fits people who want a private mailbox across those platforms. Its standout distinction is the scope of the encryption described: protection extends beyond message contents to subjects, participants, and metadata, while stored mailbox data receives zero-access encryption.
The trade-off is a narrow product focus. Mailum is suited to individuals seeking a minimal encrypted mailbox service, particularly those who value private communication details and an Android option. It is less suitable for buyers looking for a wider collaboration environment, extensive platform coverage, or a large set of verified mailbox features beyond encryption and private access. Choose Mailum when encrypted email and reduced provider access are the priority; consider a broader service when your requirements extend beyond a focused private mailbox.
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Mailum pricing
Mailum fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| End-to-end encryption | Yes |
| Zero-access storage | Yes |
| Custom domains | Not verified |
| Email alias limit | Not verified |
| Mailbox storage | Not verified |
| Mobile apps | Yes |
| Private calendar | Not verified |
| Deployment | Cloud, Mobile |
| Platforms | Web, Android |
| Support | Email, Phone |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan (source) |
| Website | letter.ws |
| Facts checked | 20 Sep 2026 |
Alternatives to Mailum
- Tuta MailA privacy-focused email suite with encrypted calendar tools and a permanent free plan.9.3
- Proton MailA mature encrypted email service with broad platform support and a capable free plan.9.2
- MailfenceA mature OpenPGP email suite with groupware, mobile access, and broad protocol support.8.9
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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