Best Secure Email Providers (2026): Top 7 Compared

Proton Mail is the email service of Proton, a company incorporated and headquartered in Switzerland. Proton describes it as an end-to-end encrypted service funded by paid subscriptions rather than advertising, and reports more than 100 million accounts across its products. Apps are available for the web, Windows, macOS, Linux, Android and iPhone, and Proton states that its apps are open source and have been independently audited for security.

Proton's support documentation explains the encryption model in detail. Message bodies and attachments are stored with end-to-end or zero-access encryption, including messages received from non-Proton addresses. Mail between Proton users is end-to-end encrypted automatically. Mail to other providers travels over TLS and is not end-to-end encrypted on arrival unless the sender uses a password-protected message. Subject lines are not end-to-end encrypted, which Proton attributes to compatibility with email standards; it follows OpenPGP.

The pricing page lists three personal plans. Free includes 500 MB of mail storage, expandable to 1 GB by completing an onboarding checklist, one address, three folders and labels, and 150 messages a day. Mail Plus adds 15 GB, 10 addresses, a custom domain, unlimited folders, 10 hide-my-email aliases and IMAP/SMTP access through Proton's Bridge app. Proton Unlimited raises storage to 500 GB and adds unlimited aliases, Proton VPN, Proton Pass and Proton Drive. A Family plan covers up to six people with 3 TB of shared storage. Proton also sells separate business plans, compared on the email encryption software page.

Tuta is an encrypted email and calendar service based in Germany. Its pricing page states that all data is stored on Tuta's own servers in ISO 27001 certified data centres in Germany, and that its client apps are fully open source. Apps are available for web, Android, iPhone and desktop, with offline support.

Tuta's encryption page describes a design that encrypts the whole mailbox, calendar and address book end to end. Sender and recipient addresses are the only unencrypted data it lists. Keys are generated on the user's device; the private key is encrypted with the user's password before it reaches Tuta, and the password is never sent to the server in plain text. Tuta lists AES-256 for symmetric encryption and RSA-2048 or x25519 combined with Kyber-1024 for asymmetric encryption, which it calls quantum-resistant. Mail between Tuta users is encrypted automatically. External recipients receive encrypted mail through a password exchanged once per contact.

Tuta chose not to implement PGP and gives its reasons on the same page. Calendar notifications are pushed to devices in encrypted form so reminders do not pass through the server readable. On paid plans, Tuta adds unlimited calendars and labels, custom domains, catch-all addresses, autoresponders, email import from EML or MBOX files and calendar sharing. Multi-user support for families is activated through support after choosing Revolutionary or Legend, and separate business plans are listed.

Mailfence is a secure email suite operated from Belgium. The company states that it launched its service in 1999, that its servers are located in Belgium under its full control without intermediaries, and that under Belgian law only local judges with a court order can request user information. The service carries no advertising or trackers.

Encryption is built on OpenPGP. According to Mailfence, cryptography happens in the user's browser, and the service is interoperable with any OpenPGP service. The integrated keystore lets users generate, import, publish and manage multiple OpenPGP key pairs without installing anything. Messages can be digitally signed so recipients can verify the sender. For recipients who do not use PGP, password encrypted messages (PEM) encrypt a message with a shared password; the recipient opens it through a link on Mailfence's servers and must receive the password by another channel. Connections use TLS with perfect forward secrecy and HSTS, and inbound mail is validated with SPF and DKIM. Two-factor authentication is available.

Beyond mail, Mailfence includes calendars, document storage with online editing and sharing, and contact groups. Storage on paid plans is divided between email and documents; Entry, for example, provides 10 GB for email and 30 GB for documents. Paid plans from Entry add custom domains with DKIM, SPF and DMARC, user management, ActiveSync and standard email client access. Pro and Ultra include priority support by email and telephone. Mailfence states that it donates 15% of Ultra plan revenue to the Electronic Frontier Foundation and European Digital Rights.

StartMail is a paid private email service with headquarters and servers in the Netherlands, which places user data under Dutch privacy law and the GDPR. The company states that it does not track email activity, profile users, serve advertising or sell data.

Encryption is message-level and based on PGP. Users can encrypt a message with one click, sign it with a PGP signature so recipients can verify it, and send password-protected email to recipients who do not use encryption; those recipients can read and reply with the password the sender set. For users who prefer a desktop or mobile mail client, StartMail documents end-to-end encryption over IMAP by configuring OpenPGP in that client.

Aliases are the other main feature. Every plan includes unlimited personal aliases that can be created and deleted at any time, and burner aliases generated with one click that disappear after one hour, intended for sign-ups and downloads. Business plans add unlimited custom domains and shared aliases with multiple recipients for addresses such as support@. StartMail also warns users before they open external links, blocks tracking pixels, deletes mail emptied from the trash immediately, and offers an import tool for moving contacts and mail from other providers.

Group subscriptions let a family or team add any number of extra accounts at 25% off. Support is available around the clock and, according to StartMail, is staffed by people rather than chatbots. Apps are available for iOS and Android, and the webmail runs in any browser.

Posteo is an ad-free German email provider that has operated since 2009. For 1 EUR per month it provides email, calendar, address book and notes, compatible with phones, tablets and desktop programs over IMAP and POP3, with CalDAV and CardDAV synchronisation and a web app. Posteo states that it uses only open-source software and free protocols, runs on green energy from Green Planet Energy, and answers support requests by email.

Privacy measures start at sign-up, which requires no personal details. Posteo's payment page explains that payment data is kept separate from email accounts; bank transfers and cash payments are matched through single-use codes that are deleted once credit is applied. Posteo publishes a transparency report.

The encryption page sets out several layers. Access to Posteo is always encrypted, and mail to other servers is sent over TLS with perfect forward secrecy and DANE where the other server supports it. Passwords are not stored in plain text, and two-factor authentication with TOTP is available. Crypto mail storage, once activated, encrypts all stored mail, including content, attachments and metadata, using AES and HMAC with bcrypt hashing; Posteo states it cannot deactivate this encryption. Inbound encryption can encrypt all newly arriving mail with the user's S/MIME or OpenPGP key. Calendar and address book data can also be encrypted. End-to-end encryption of individual messages relies on S/MIME or OpenPGP on both sides, and metadata such as subject and sender then remain unencrypted. With an S/MIME certificate, the Posteo S/MIME add-on can also send password-encrypted mail to any recipient as an encrypted PDF.

Attachments up to 100 MB can be sent and received, and a migration service copies up to three external accounts.

Runbox is an email service based in Oslo, Norway, funded entirely by subscriptions. Its privacy page states that its email servers are owned and operated by Runbox and housed in a high-security facility in Oslo originally built for the Norwegian Government in the early 1980s. Runbox says it discloses data to authorities only on a Norwegian court order or a breach of its terms or Norwegian law, and contrasts this with US rules such as the CLOUD Act. It has an appointed Data Protection Officer for GDPR compliance and publishes a transparency report.

Runbox does not describe its storage as end-to-end encrypted. Its documentation states that mail is encrypted in transit between the user's device and its servers, and between Runbox and other providers where possible, and that users who want end-to-end privacy can add S/MIME or PGP. Runbox states that mail is never scanned to serve ads or for data mining, and that no unauthorized third party, including advertisers or analytics companies, can access user data. Account protection includes TOTP two-factor authentication, app passwords for desktop mail programs and a trusted-browser option. The Runbox 7 web app is open source on GitHub, though Runbox notes that not all components are.

Plans are sized by storage and domains. Every account includes 100 aliases on Runbox domains, unlimited aliases on the buyer's own domains, 100 MB messages and limits of 5,000 incoming and 500 outgoing messages a day. Custom domain limits range from one on Micro to 100 on Max250. Main accounts can add subaccounts, each with its own plan, storage and settings, billed through the main account.

Zoho Mail is the business email service of Zoho, offered on its own or inside the Zoho Workplace suite with file storage, documents, chat and meetings. Zoho promises not to show advertising or sell data to third parties, and its pricing page lists more than 550,000 customers.

Zoho's security page describes a different model from the privacy-first providers on this page. Data is encrypted at rest and in transit: mail is stored on Zoho's servers in encrypted form, with the key, in Zoho's words, managed with utmost security, and TLS and S/MIME protect messages in transit. Zoho states that employee access to customer data is restricted and monitored, and that selected staff may see obfuscated data in rare cases to resolve an issue. It also lists S/MIME and OpenPGP among its encryption options. The page covers administrator tools against phishing and malware, identity and access management, multi-factor authentication through Zoho's MFA app, and organisational security policies. It does not describe zero-access storage or automatic end-to-end encryption between users.

Plans are priced per user. Mail Lite covers custom-domain email with 5 GB or 10 GB per user. Mail Premium adds 50 GB of mail storage plus 50 GB of retention storage, eProtect retention and eDiscovery, S/MIME, mobile access management and a data loss prevention feature in beta. Workplace Standard and Professional bundle mail with WorkDrive, Writer, Sheet, Show, Cliq, Meeting and the Vault password manager, and Professional also includes S/MIME and retention. A dedicated migration agent is available for companies with more than 50 users. Zoho's Trident desktop app combines mail, calendar, chat and meetings on macOS and Windows.