ProtonMail Alternatives in 2026: 9 Secure Email Services Compared

Tuta, formerly Tutanota, is the closest direct replacement for Proton Mail. It encrypts mail body, subject lines, calendar and contacts, and it uses post-quantum encryption for newer accounts. Its apps are open source, its servers are in Germany, and its paid Revolutionary plan starts at EUR 3 per month billed yearly for 20 GB of storage.

The main limit is app lock-in. Tuta does not support IMAP and has said it will not build a bridge, so you can only read mail in Tuta apps or webmail. If you are happy to switch apps, Tuta is the strongest privacy pick here. If you rely on Apple Mail, Thunderbird or Outlook, look at mailbox.org or Fastmail instead.

Fastmail is our pick for people who want a Gmail-like experience without Google's data model. It is fast, its search is excellent, and it works over IMAP and JMAP in any standard email app. Custom domains are included, masked addresses help with signups, and its calendar includes scheduling links. The entry plan starts at $5 per month billed yearly.

Fastmail does not offer end-to-end encryption, because it keeps mail searchable on its servers with server-side encryption. That is a deliberate trade-off for speed and features, not an oversight. If maximum encryption matters more than polish, Tuta or mailbox.org will suit you better.

mailbox.org is a German provider that gives you privacy without forcing you into one app. It works in any email app over IMAP, and its Guard feature adds PGP and S/MIME encryption in webmail. The Light plan starts at EUR 1 per month billed yearly, while Standard at EUR 3 per month billed yearly adds a custom domain and more storage.

The catch is effort. End-to-end encryption here means setting up PGP, not the automatic encryption Tuta and Proton Mail offer between their own users. mailbox.org suits people who value app freedom and are willing to learn PGP basics. If you want automatic encryption with no setup, Tuta is simpler.

Posteo is the simplest private email option on this list. For EUR 1 per month you get 2 GB of storage that can be expanded, encrypted mail storage, and full IMAP support in any app. Posteo is based in Germany, runs on renewable energy, and avoids ads and tracking in its service.

Posteo is deliberately plain. There is no free plan, and end-to-end encryption requires PGP setup rather than happening automatically. Its webmail is functional rather than polished. For a low-cost, no-nonsense private mailbox, Posteo is hard to beat, as long as you do not expect a modern app experience.

Startmail suits people who want PGP encryption without a steep learning curve. Its webmail offers one-click PGP, so you can send encrypted mail to other PGP users without managing keys by hand. It also offers unlimited aliases, which helps you give a different address to every service. Paid plans start at $4.99 per month billed yearly.

Startmail costs more than the cheapest German providers, and there is no free plan. It also does not match Tuta's automatic encryption model, because PGP still needs the other person to use PGP. For alias-heavy users who want usable PGP, Startmail is a strong middle ground.

Mailfence is a Belgian provider that bundles OpenPGP email with calendar, contacts and document tools. Its free plan lets you test the service before paying, and the entry paid plan starts at EUR 2.50 per month. Mailfence also supports IMAP on entry paid plans and above, so you are not locked into webmail alone.

The interface is less polished than Fastmail or Tuta, and some features sit behind higher tiers. Mailfence suits users who want an integrated office-style suite with PGP, rather than a mail-only app. If design matters most, Fastmail will feel more modern.

Zoho Mail is the business pick here. It offers own-domain email, admin controls and integration with Zoho's CRM, docs and workplace apps, which suits small teams that need more than personal mail. There is a free plan for small personal use, and paid business plans are priced per user.

Zoho Mail is not designed as an end-to-end encrypted privacy service, so it does not match Tuta or Posteo on that measure. It suits firms that want affordable, reliable business email with good controls, rather than maximum encryption. Check its current pricing page, because business plan prices vary by region and billing term.

Runbox is a good budget choice for own-domain email. Its entry plan starts at EUR 19.95 per year, which is cheaper per month than most rivals, and it supports custom domains and standard email apps. Runbox is based in Norway and has run since 2000, which gives it a longer track record than many newer privacy services.

The webmail interface is dated, and PGP encryption needs extra setup rather than being built in by default. Runbox suits people who want a stable, low-cost mailbox for their own domain and do not need modern design or automatic encryption. For a polished app, Fastmail is the better spend.

Kolab Now offers hosted email with calendar, contacts and groupware features, hosted in Switzerland. It suits users who want a privacy-focused alternative to Google Workspace rather than a mail-only service. Standard app support means you can use it with desktop and mobile email clients.

Pricing and plan details are less prominent than on rival sites, so request a current quote before comparing totals. Kolab Now also has a smaller user community, which means fewer guides and third-party tools. For Swiss-hosted groupware with strong privacy practices, it is still worth a trial.