Updated October 2, 2026 · ShieldCue Editorial Team

Top secure email and messaging compared

60 providers, ranked on the terms we checked.

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Top secure email and messaging compared
#	Provider	Score	Features	Key facts	Actions
21	SimpleLogin	9.2/10	Free Budget	Price from: $4 Free plan limits: 10 aliases, unlimited bandwidth, 1 mailbox, no custom domains End-to-end encryption: Forwarded emails optionally PGP-encrypted with the user's own key before leaving the server (Premium only); email in transit only, TLS 1.1-1.3	Review Compare See alternatives
22	SimpleX Chat	9.2/10	Free	Free plan limits: Free End-to-end encryption: Messages, files and voice messages, plus audio and video calls, are end-to-end encrypted; relay servers cannot decrypt content Jurisdiction: GB	Review Compare See alternatives
23	Threema Test Now for Free - Threema Work: 30 days with 30 users	9.2/10	Free Budget	Price from: CHF 3 Free plan limits: Unlimited messages, free updates for all platforms, max. 200 users; private app is a one-time 6.00 purchase End-to-end encryption: All messages, voice and video calls including group calls, and shared files, encrypted end to end between the participants; Threema itself cannot read the content	Review Compare See alternatives
24	Delta Chat	9.1/10	Free	Free plan limits: Free and open source with no advertising or paid tier; donations fund development End-to-end encryption: All messages end-to-end encrypted by default, including all attachments and attachment metadata such as filenames; group and contact metadata end-to-end encrypted and stored on end-user devices only; unencrypted messaging only possible if a classic email server is configured as relay Jurisdiction: DE	Review Compare See alternatives
25	Hushmail Hushmail for Healthcare free trial: 14 days free	9.1/10	Free Budget	Price from: $11.99 Free plan limits: Free account with limited email storage, personal use only, no commercial use End-to-end encryption: Email messages, encrypted file attachments, recipient replies on a secure web page and secure web form submissions, using OpenPGP and TLS/SSL	Review Compare See alternatives
26	InfoCert PEC gratis per 6 mesi (PEC Legalmail Silver): 6 months free, no credit card required	9.1/10	Free Budget	Price from: €5.90 Free plan limits: 6 months free PEC Legalmail Silver, no credit card and no automatic renewal, 2 GB mailbox plus 6 GB secure archive Jurisdiction: IT	Review Compare See alternatives
27	Session	9.1/10	Free Budget	Price from: $2.99 Free plan limits: Attachments up to 10MB; longer messages, unlimited pins, animated display pictures and badges are Pro-only End-to-end encryption: 1:1 messages, group chats, attachments and calls are end-to-end encrypted; Communities are only encrypted in transit to a self-hosted server, not end-to-end encrypted	Review Compare See alternatives
28	Tuta 50% discount for NPOs and schools: 50% off subscription	9.1/10	Free	Free plan limits: 1 GB storage, 1 calendar, 3 labels, no custom domains End-to-end encryption: Whole mailbox including email, subject lines, headers, calendar, contacts and drive data; external recipients via shared password Jurisdiction: DE	Review Compare See alternatives
29	Zoho Books 14-day free trial: 14 days free	9.1/10	Free Budget	Price from: $12 Free plan limits: 1 user + 1 accountant; up to 1,000 invoices and 1,000 expenses per year; 50 receipt autoscans per month; 5 scheduled reports; free while annual revenue stays under $50,000 USD Jurisdiction: IN	Review Compare See alternatives
30	Cloudflare WARP+ free trial where offered	9.0/10	Free	Price from: $4.99 Free plan limits: No free plan: Email Security is an add-on on Contract plans only Jurisdiction: US	Review Compare See alternatives

About Top secure email and messaging compared

Secure email covers two different jobs here. Some members hand out aliases that forward mail to an address you already own, so a shop or a forum never sees your real inbox. Others are complete mailboxes, and a couple are messengers or network connections where encryption is built in. This ranking sets 60 brands across that mix, and it sorts on what you pay at the two moments that matter: the price you meet at signup, and the same service priced on a longer commitment. Those figures rarely match. The group median entry price is €4.38, while the longer-term price is €4.67, so a cheap opening can settle into a steady monthly charge. The second question is what the payment buys. Alias services are judged on custom domains, free limits and how the forward is protected. Mailboxes are judged on where the operator is registered and how encryption works between you and the person you write to. A free tier is normal here, at 78% of the group, so paying at entry is optional for a trial run.

How we picked

Every member here is scored on a weighted set of inputs, tuned for this category. Cost carries 40%, because the price at entry and the price on a longer commitment decide who keeps paying. The offer itself carries 40%, covering custom domains, free tier limits, open source code and how encryption actually works between you and the other party. Trust carries 20%, drawn from the registered legal entity, the headquarters country and the jurisdiction your data falls under. Each input comes from the provider's own material: support pages for encryption and alias behaviour, pricing pages for entry prices and plan models, legal notices and terms for the entity and jurisdiction, and encyclopaedia entries for founding years and headquarters. A limit stated by a provider is carried into the copy as stated rather than smoothed away, and a yes or no in the source is written as a yes or no. Partners, where a ranking carries any, are listed first and set apart from the scored order. Partners that serve your country are listed first in this ranking, then the rest by score.

How we rank

Our top picks

5. Proton AG
Proton AG sits in this ranking as the connection entry rather than a mailbox, and its encryption line is worth reading closely: what is protected is the tunnel from your device to Proton's servers, not the content of what you send. The company is Proton AG, founded in 2014, based in CH and answerable under CH law, with open source code. Its free plan is the open ended one in this group, covering a single device and servers picked at random from a limited set of countries at medium speed, as No data or speed limits, no ads, no time limit, 1 device, servers in 10 countries randomly selected, medium speed. sets out. Support runs on email, chat and help centre. SimpleLogin below forwards mail to your inbox and can encrypt a forward with your own key on a paid plan.
- Devices: 10
- Server countries: from 140
- No-logs audit: Securitum, 2026
Pros
- No-logs claims are audited rather than asserted: Securitum's audit (Securitum, 2026) sits behind a No activity logs policy.
- Free limits come with no caps on data or speed, no ads and no time limit.
- 10 simultaneous devices, above the ranked VPN median of 8.
- Servers in from 140 countries, with streaming for Netflix, Hulu and Disney+ and WireGuard and OpenVPN as the connection protocols.
- A single account carries the VPN, a passkey vault with end-to-end encryption and 5 GB of free storage, with GDPR, HIPAA and ISO 27001 compliance reported.
Cons
- Support runs on email, chat and help centre, and there is no phone line among them.
- The free plan limits put you on a single device at medium speed with randomly selected countries, so constant use points at a paid plan.
- End-to-end encryption is marketed for Proton for Business, while the consumer plan encrypts only the connection from your device to Proton's servers.
- The plan set is aimed at business buyers, so a home user ends up paying for features built around teams.

What to look for

Entry price, checked twice: The price shown at signup is not the whole story. The group median entry price is €4.38, while the longer-term price is €4.67. A service that looks cheap on a headline can settle higher once a trial ends, so read both figures on the same plan name before you commit.
What a free tier really allows: A free plan is common in this category, at 78% of the group, though the caps differ. Median free storage is 1. Alias services limit aliases or recipients, mailboxes limit storage and daily recipients. Posteo and Runbox sit outside the free tier group, so read their paid terms closely.
Custom domains for aliases: Custom domains are supported by 86.1% of the group, which lets an alias live on a domain you control rather than the provider's own. Apple Hide My Email, Apple Inc. and Posteo do not offer them. If you run a site, this decides whether your aliases can match your own name.
Open source code: Open source software appears in 69.8% of the group, covering addy.io, Posteo, Session, Runbox, Threema, Proton AG and SimpleLogin. Open code lets outside readers check what a service does with forwarded mail, which matters most where encryption is offered as an option rather than as the default.
Support you can actually reach: Help centres are close to universal here at 94.9%, with email support close behind at 81.4%. The Apple entries add phone lines, and Apple Inc. and Proton AG add live chat. Alias services tend to answer by email, so allow a reply into your support plans.
What the encryption claim covers: A no-knowledge claim is listed for 77.8% of the group, but the wording covers different things. Threema states it cannot read message content, Session encrypts chats and calls end to end, while the alias services encrypt in transit and offer key based encryption on some plans. Read where the claim applies.

Frequently asked questions

Is a free alias service as private as a paid mailbox?+

Not on encryption. The free tiers of addy.io and SimpleLogin hand out aliases and forward mail, but stored mail is not end-to-end encrypted at either. SimpleLogin can PGP-encrypt a forward with your own key on the Premium plan, and addy.io can encrypt forwarded mail to the recipient's public key with GPG or OpenPGP. Threema and Session protect message content end to end as standard, so that level of privacy sits on a paid plan with the alias services.

What is the difference between an alias and a real mailbox?+

An alias forwards to an address you already own, which is what Apple Hide My Email, Apple Inc., addy.io and SimpleLogin do. A mailbox stores the mail itself, which is what Posteo and Runbox provide, with webmail storage and custom domain support. Session and Threema sit outside both, carrying messages inside an app rather than a mailbox. The choice comes down to whether you want to keep your present inbox.

Which of these encrypt messages end to end by default?+

Threema and Session. Threema encrypts messages, voice and video calls including group calls, and shared files end to end between participants, and states it cannot read the content. Session encrypts direct messages, group chats, attachments and calls, though its Communities are encrypted in transit only. Posteo can protect individual webmail emails with S/MIME or OpenPGP, and Runbox offers that per message between sender and recipient. Apple relays and forwards aliases with no end-to-end encryption.

Do I need a custom domain?+

Custom domains are supported by 86.1% of this group, but not by every member: Apple Hide My Email, Apple Inc. and Posteo do not offer them. A custom domain keeps an alias on a name you control, which helps if you run a site. Without one, aliases sit on the provider's own domain, which is simpler but leaves the naming with them.

What will I pay at signup and afterwards?+

The group median entry price is €4.38 and the longer-term price is €4.67, so both are worth reading before you commit. A free tier is normal here, with 78% of the group offering a permanent free plan. Posteo and Runbox sit outside that group, so budget for the paid tier from the start. Prices are quoted in several currencies, so check what your own card will charge.

Why does the country of the company matter?+

Because the operator's home country sets which law your data falls under, and every member here names its jurisdiction. Session, Threema, Proton AG and SimpleLogin list CH, CH, CH and CH. Posteo sits in DE, Runbox in no, addy.io in GB and Apple in US. For readers inside the EU, a European entity is often the simpler starting point.

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