SMTPy vs SimpleLogin: The Definitive Comparison for 2026

Email aliasing is booming, driven by growing awareness of privacy issues. Two solutions stand out: SimpleLogin, a pioneer acquired by Proton in 2022, and SMTPy, a French-hosted alternative. This comparison will help you choose based on your needs.

At a Glance

Criteria	SMTPy	SimpleLogin
Hosting	France (dedicated infrastructure)	Cloud (Proton servers, Switzerland)
Custom domain	✅ Yes (all plans)	✅ Yes (paid)
Built-in mailbox	✅ Yes (read, reply, forward)	⚠️ Partial (reply from alias)
Free plan	1 domain, 10 aliases, 100 emails/mo	10 aliases, no custom domain
Paid starting price	€9/month	€4/month (30 aliases)
Unlimited aliases	✅ Pro plan (€9/mo)	✅ Premium plan
API	✅ Full REST + API keys	✅ Available
Data sovereignty	✅ Your server or France	⚠️ Switzerland (Proton)

Hosting and Privacy

SimpleLogin is owned by Proton since 2022. Data is hosted in Switzerland with a strict privacy policy. It is a good option if you trust the Proton ecosystem.

SMTPy hosts your data in France, on dedicated infrastructure subject to French law and the GDPR — outside extraterritorial jurisdiction and away from US hyperscalers.

Custom Domain

SimpleLogin offers custom domains from the Premium plan. SMTPy includes custom domains on the free plan — it's actually its core design principle.

Built-in Mailbox

This is where SMTPy stands out: it offers a real web mailbox for reading, replying, forwarding, and composing emails directly from the interface. SimpleLogin allows replying from an alias (by replying to the forwarded email), but without a dedicated messaging interface.

Pricing

SimpleLogin is cheaper at entry level (€4/month for 30 aliases) if you don't have a custom domain. SMTPy becomes more competitive once you have multiple domains or professional usage.

When to choose SMTPy?

• You want to use your own domain for aliases
• You want your email data hosted in France, under EU law
• You need a full mailbox to reply from your aliases
• You're building applications and want a powerful API
• Data sovereignty is a priority

When to choose SimpleLogin?

• You want a turnkey service without server administration
• You already use the Proton ecosystem (ProtonMail, ProtonVPN)
• You want aliases on shared domains (simplelogin.com)

See also: Full SMTPy vs SimpleLogin comparison · Complete guide to email aliases