AutoCatch vs SimpleLogin
The objective of abstracting an email address generally falls into two buckets: protecting a human identity or triggering a machine workflow. While both tools facilitate domain-level forwarding, they are engineered for fundamentally different endpoints.
SimpleLogin.io (now a Proton-owned service) focuses on creating a “privacy shield” for users, while Autocatch.mx acts as a high-performance “data ingestion” engine for developers and automated systems.
📊 Feature Matrix
| Feature | Autocatch.mx | SimpleLogin |
|---|---|---|
| Philosophy | Email-as-Data (Ingestion) | Email-as-Identity (Privacy) |
| Alias Creation | Automatic Discovery | Manual, App-driven, or Catch-all |
| Inbound Protocol | Webhooks (JSON) | SMTP Forwarding |
| Outbound Support | No | Yes (via Reverse Aliases) |
| Encryption | Standard TLS | PGP Support |
| Data Retention | 7 days to Unlimited | Instant Passthrough (No logs) |
🛠 Mechanics Deep Dive
How Aliases are Created
Autocatch.mx:
This is a purely discovery-based system. There is no dashboard step required to “create” an alias. Once the MX records are pointed to Autocatch, every string prefix (e.g., user.auth@domain.com) is immediately active. The system discovers the alias upon the first incoming packet and begins routing based on predefined patterns.
SimpleLogin:
Aliases are primarily created via intentional action. Users generate them through a browser extension, mobile app, or the web dashboard. While it does support a catch-all feature for custom domains (allowing anything@yourdomain.com to work on-the-fly), the platform is optimized for curated alias management, allowing users to toggle individual addresses on or off with a single click to stop spam at the source.
How Data is Routed
Autocatch.mx:
The system is built for Business Concern Management. It treats the “To” address as a parameter for routing logic. For example, emails to invoices.vendorA@domain.com can be parsed and multi-forwarded to both a Slack webhook and an accounting inbox. It holds the payload (including attachments) in a searchable log for up to 7 days (or longer on Pro tiers) to ensure no data is lost during API downtime.
SimpleLogin: The system is a 1-to-1 Privacy Wrapper. When an email arrives at an alias, SimpleLogin replaces the “From” header with a Reverse Alias. This allows the user to hit “Reply” in their standard email client; the reply goes back to SimpleLogin, which then “unmasks” the sender and forwards the reply to the original recipient. The focus is on maintaining a seamless two-way conversation without ever revealing the user’s true email address.
🔌 Integration & Extensibility
Autocatch.mx (The Automation Engine) Integration is centered around Webhooks. When an email is “caught,” Autocatch converts the SMTP data into a flattened JSON POST payload. This is designed for developers piping email into AI agents, custom databases, or low-code platforms like Zapier and n8n. It is the “input” side of an automation stack.
SimpleLogin (The Privacy Stack) Integration is centered around Native Experience. With browser extensions and a deep integration into the Proton ecosystem, SimpleLogin is designed to live where the user signs up for services. It also supports PGP Encryption, meaning it can encrypt incoming emails with your public key before forwarding them, ensuring that even if your primary inbox (like Gmail) is compromised, the content of your forwarded mail remains unreadable.
🏁 The Final Vibe
Autocatch.mx is a developer’s pipe. It is built for the founder who wants to turn a domain into a programmable stream of data, where every unique address serves as a new filter or trigger for an internal system.
SimpleLogin is a user’s shield. It is built for the individual who wants to compartmentalize their digital life, manage their identity via a dashboard, and maintain the ability to have secure, anonymous two-way correspondence.