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Posteo

Posteo is a Berlin-based green email service at EUR1/month with anonymous sign-up, encrypted storage, CalDAV/CardDAV sync, and an infrastructure running entirely on renewable energy — no custom domains, no ads, no tracking.

Our take

Posteo is the most principled email service in this comparison: EUR1/month, renewable energy, anonymous sign-up, no advertising, no data mining, no custom domains. The product is built around a philosophy rather than a feature checklist — if you agree with that philosophy, the price and privacy posture are hard to match.

The honest structural limit: Posteo does not support custom domains. If having an @yourname.com or @yourcompany.com address matters, you need Fastmail, Mailbox.org, or Mailfence. Posteo accounts use @posteo.de and regional variants. For professionals who need a custom domain for correspondence, this is disqualifying.

What stands out

Anonymous sign-up with cash payment. You can create a Posteo account providing no personal information and pay cash by mail. This is not just a privacy claim — it is an operational reality that the business model supports. Almost no legitimate email provider offers this combination.

Renewable energy. The entire infrastructure runs on power from Greenpeace Energy. For users for whom environmental impact is a criterion in software selection, Posteo is the only major email provider with this commitment.

Crypto mail storage. Optional at-rest encryption of stored messages adds a layer beyond standard server encryption. This is not zero-access encryption (Posteo holds the key), but it is a meaningful protection against unauthorized server access.

Where it falls short

No custom domains and no mobile app are the constraints that most frequently disqualify Posteo. The web interface is deliberately minimal — it does calendars, contacts, and email, nothing more. For users who want a Notion-like productivity layer on top of their email, Posteo is not that.

Who should pick Posteo

Pick Posteo if privacy and anonymity are paramount, custom domains are not required, and you want the lowest-cost legitimate email service with a strong ethics position. It is the right email address for a privacy-conscious individual’s personal account. Skip it for custom domain needs, business accounts, or if mobile app convenience is important.

References

Pros

  • EUR1/month is among the lowest prices for a privacy-respecting email service with a legitimate business model
  • Anonymous sign-up and cash payment are almost uniquely available at a legitimate commercial email provider
  • Renewable energy infrastructure: the full service runs on green energy
  • Simple, transparent pricing with no tiers or upsells
  • DANE transport security adds a meaningful layer of email delivery authentication

Cons

  • No custom domain support — all accounts use @posteo.de or regional variants (@posteo.net, @posteo.at, etc.)
  • No native mobile app — requires configuring a third-party IMAP client on iOS or Android
  • Web interface is minimalist and functional, not modern or feature-rich
  • No end-to-end encryption by default — crypto mail storage encrypts messages at rest on Posteo's server, but it is not the same as E2EE where only the user holds keys
  • No shared mailboxes, team features, or business plans — individual use only

Features

  • 2 GB encrypted email, calendar, and contact storage at EUR1/month
  • Anonymous sign-up: no name, address, or payment details linked to your identity
  • Cash-by-post payment accepted for completely anonymous accounts
  • Crypto mail storage: optional encryption of stored messages on Posteo servers
  • Transport encryption (TLS) with DANE for enhanced server authentication
  • Two-factor authentication via TOTP apps
  • CalDAV and CardDAV sync for calendar and contacts with any compatible client
  • IMAP, POP3, and SMTP access for third-party email clients
  • Infrastructure runs entirely on renewable energy (Greenpeace Energy)
  • Spam filtering and virus protection included
  • No mobile app — users connect via IMAP with any Android or iOS email client
  • Founded 2009, independent German provider