What is the best alternative to Posteo?

On listme.name the highest-scored alternative is Proton Mail, followed by Tuta. The right choice depends on price, platform and whether you need open source.

Is there a free alternative to Posteo?

Yes. Free options include Proton Mail, Tuta, Mailfence.

Alternatives

Best Posteo alternatives in 2026

Posteo is ad-free email from a Berlin lab with anonymous registration. These 9 alternatives come from the same rankings, ordered by editorial score. Connected products carry a small, disclosed lift.

9 alternatives From best secure email providers How we rank Share

Ranked alternatives

1
Proton Mail
Has a free option; is open source; also runs on iOS, Android, macOS. Zero-access encryption, a free plan and apps on every major platform, with the web client published under GPL-3.0. Custom domains and extra storage need the paid plans.
Best for Private email with a free plan and apps
WebiOSAndroidmacOSWindowsLinuxFree plan, paid upgradesOpen source
92.0of 100
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2
Tuta
Has a free option; is open source; also runs on iOS, Android, Windows. End-to-end encrypted mail and calendar on a free plan with post-quantum encryption, open-source clients under GPLv3 and servers in Germany. The free plan has only 1 GB of storage.
Best for Encrypted email and calendar on a free plan
WebiOSAndroidWindowsmacOSLinuxFree plan, paid upgradesOpen source
90.0of 100
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3
Mailfence
Has a free option; also runs on iOS, Android. OpenPGP encryption in the browser and a free plan with 1 GB, under Belgian privacy law. It needs OpenPGP key management, which adds setup that Proton and Tuta do not need.
Best for OpenPGP email in the browser with a free plan
WebiOSAndroidFree plan, paid upgrades
86.5of 100
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4
StartMail
Hosted in the Netherlands, with PGP encryption in the web app, unlimited aliases and no ads. It has no free plan beyond a 7-day trial that asks for payment details, so it costs money from the start.
Best for Paid private email with PGP and custom domains
WebSubscription
85.5of 100
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5
Runbox
Norwegian hosting under Norwegian privacy law, browser PGP compatibility and renewable electricity. It has no free plan after the 30-day trial and lists only the web platform.
Best for Norway-hosted email with PGP compatibility
WebSubscription
83.0of 100
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6
mailbox.org
German data centers certified to ISO 27001, with plans from 1 euro a month after a 30-day trial. The entry plan has 2 GB of mail storage, and there is no free plan after the trial.
Best for German-hosted email with cheap entry plans
WebSubscription
81.5of 100
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7
CTemplar
Has a free option. Iceland-based email with anonymous sign-up and a free membership granted by invitation. Paid tiers start at $8 a month, and the site describes strong encryption without naming a protocol.
Best for Anonymous users who can get an invitation
WebFree plan, paid upgrades
80.0of 100
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8
Disroot
Has a free option. A privacy platform with free accounts, a 1 GB mailbox, SSL transport and PGP through Mailvelope. Its email page does not state where the servers are, and PGP needs a browser add-on and key setup.
Best for Free email with optional PGP for privacy-minded users
WebFree
76.5of 100
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9
Hushmail
Also runs on iOS, Android. Encrypted email with OpenPGP and SSL, sold mainly to healthcare, legal and small business customers, with a personal use plan. Its pricing page does not state a hosting location, and healthcare plans have 14-day trials.
Best for Personal users who want OpenPGP email with a trial
WebiOSAndroidSubscription
74.0of 100
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Free alternatives to Posteo

Open-source alternatives to Posteo

Posteo alternatives for Linux

Posteo alternatives for Windows

Posteo alternatives for macOS

Posteo alternatives for Android

Posteo alternatives for iOS

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About Posteo alternatives

What is the best alternative to Posteo?: On listme.name the highest-scored alternative is Proton Mail, followed by Tuta. The right choice depends on price, platform and whether you need open source.
Is there a free alternative to Posteo?: Yes. Free options include Proton Mail, Tuta, Mailfence.