Best Privacy-First Email for Developers in 2026: Proton vs Infomaniak
Every side project ends up needing two different things from email, and most guides only talk about one of them. The first is a human mailbox : you@yourdomain.dev , read on a laptop and a phone, kept away from an advertising company. The second is an outbound SMTP endpoint : the thing your app authenticates against at three in the morning to send a password reset. These are not the same job, the…
Developers often need two distinct types of email services for their side projects: a human mailbox for personal use and an outbound SMTP endpoint for automated tasks. Treating these two needs as one can lead to silent signup failures. This article compares two privacy-focused providers, Proton and Infomaniak, focusing on their features and pricing as of October 2026.
Proton's entry paid tier, Mail Plus, costs $3.99/user/month when billed yearly, while Infomaniak's Business entry plan, Mail Essentials, costs CHF 6.99/user/month, equivalent to €1.91/month. Proton offers 15 GB of mailbox storage on its Mail Essentials plan and unlimited storage on its Mail Service plan. Infomaniak provides 50 GB of bundled cloud storage per user on its Standard plan and 3 TB on its Business plan.
Proton's end-to-end encryption is a unique feature that ensures no one, including the provider, can access users' emails. However, it comes with limitations, as Proton Bridge is required for desktop clients like Thunderbird or Apple Mail. Infomaniak, on the other hand, offers standard IMAP and SMTP, making it easier to integrate with existing tools without additional setup.
Both providers allow applications to send email, but Proton's SMTP submission requires generating and storing submission tokens for each custom-domain address, while Infomaniak uses ordinary SMTP authentication. Proton's limits on email sending are not publicly disclosed, which may pose risks for applications sending a high volume of emails. Infomaniak, however, provides more straightforward SMTP authentication with fewer limitations.
When setting up email for a side project, it is crucial to consider the specific threats being addressed and choose a provider that best fits the needs. Proton offers the highest level of privacy with end-to-end encryption, but it requires additional setup and may cause issues for applications relying on consistent email delivery.
Infomaniak, with its standard IMAP and SMTP, is easier to integrate but does not provide end-to-end encryption. Ultimately, the choice depends on the developer's priorities and the specific requirements of their project.
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