For fewer email-open signals, Proton Mail and Tuta Mail take different approaches. Proton says it blocks known tracking pixels and proxies remote images so they can still display. Tuta says it blocks external images by default and loads them only when you allow them. Choose Proton if you value image convenience; choose Tuta if you prefer a stricter no-remote-content default. Neither approach guarantees that every tracking method is stopped.
How email tracking works—and what a provider can control
Many open-tracking techniques rely on remote content: when a message displays an image or other resource hosted elsewhere, the remote server may receive a request that signals the message was opened. A tiny tracking pixel is one familiar example, but it is not the only mechanism. A 2025 study examined image, font, audio, video, and CSS-based vectors across eight popular email services.
That distinction matters when comparing providers. A service may block known pixels or prevent images from loading automatically without stopping every possible signal in every email client. The study authors wrote that “all email providers except Tuta Mail leak at least one email open signal to the tracking server, accounting for more than 2 billion users.” This finding refers to the providers, clients, and default settings they tested; it is not a guarantee about every current version or configuration.
Proton Mail vs. Tuta Mail for avoiding tracking
| Service | Remote-content approach | Best fit | Important qualification |
|---|---|---|---|
| Proton Mail | Proton says it blocks known tracking pixels and loads remote images through a proxy. | Readers who want remote images to remain visible while reducing known pixel tracking. | The 2025 study found that its tested Proton Mail Android client did not leak through regular <img> pixel tracking in the examined case, but did leak through certain <picture> and CSS-background vectors. Those are study-specific results, not a statement about every client or current setup. |
| Tuta Mail | Tuta says images are blocked by default and external content does not load unless the user permits it. | Readers who prefer remote images not to load without an explicit action. | Messages that depend on remote images may look incomplete until images are allowed. Tuta also describes stripping IP headers. |
Proton’s comparison page says its feature comparison is based on public information as of June 2026. These are distinct strategies, not a universal ranking: proxying can preserve image display while depending on the provider’s filtering and proxy behavior; blocking avoids automatic external-image requests but can hide legitimate visual content.
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Which service should you choose?
Choose Proton if image convenience matters
Proton is the more natural fit if you want ordinary remote images to display while the service filters known tracking pixels and proxies image requests. Its stated protections are useful, but should not be read as blocking all email tracking: the study’s Android-client findings show that other tested vectors can remain.
Choose Tuta if you want a stricter default
Tuta is the better fit if you would rather decide message by message whether external images load. That default limits automatic remote-image requests, with the tradeoff that image-dependent messages can lose some visual context until you permit the content.
Rank #2
Consider client compatibility and migration
Default behavior can differ by client, configuration, and tracking vector. Before switching, check that the service works with the email apps and devices you rely on, and consider the effort of moving your address, contacts, and existing messages. The available provider comparisons describe broad features, but do not establish a reliable current apples-to-apples price or tier-limit comparison.
Use aliases to limit exposure of your main address
A unique alias or masking address for signups can reduce how often websites see your primary email address and can help limit address-based spam correlation. The Associated Press names DuckDuckGo Email Protection, Firefox Relay, Addy.io, and SimpleLogin as examples. An alias does not stop a tracking request embedded in a message delivered to that alias; it complements, rather than replaces, remote-content controls.
Privacy features are not all the same
Anti-tracking and encryption solve different problems
Remote-content controls address requests that can reveal an email was opened. Encryption protects message content in specified circumstances; it does not, by itself, prevent an external image or other resource from reporting a request.
Tuta says it encrypts email, calendar, and contacts by default and describes generating keys locally. Proton describes end-to-end and zero-access encryption for covered content. These are provider descriptions, not a claim that every message exchanged with every outside recipient receives the same protection.
Rank #4
External email can have different handling
Proton’s privacy policy says unencrypted incoming messages from external providers and outgoing messages to external non-Proton services may be scanned for spam and viruses before encrypted storage. Account for that distinction when evaluating encryption claims; the protection depends on the message and how it is exchanged.
Quick Recap
How to make a practical choice
- Decide how much image friction you accept. If automatic display matters, consider Proton’s proxy-and-filter approach. If you want external images held back until you allow them, consider Tuta.
- Check the client you actually use. The independent study tested particular services and clients, so do not assume results for one app apply to another.
- Use an alias where it helps. Give sign-up services a unique masked address when you want to avoid exposing your primary address; keep remote-content protections in place for tracking inside messages.
- Compare current plans directly. Prices and tier limits are not established here as a stable, like-for-like comparison, so consult each provider’s current plan information before choosing.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
