Syvel is a **French API for detecting disposable and temporary email addresses**, designed to protect your sign-up forms and maintain the quality of your user base.

## What is a disposable email?

A disposable email (or *throwaway email*) is an address created for a single use — to sign up for a service without revealing your real address, bypass a free trial, or automate bulk registrations.

These addresses cause several problems:

- **Degraded deliverability**: bounces increase, your sender reputation drops
- **Skewed analytics**: your conversions and CRM segments no longer reflect reality
- **Free-tier abuse**: trial periods are bypassed in seconds

## How does Syvel work?

Unlike solutions based on simple static lists, Syvel combines multiple signals:

### Proprietary blacklist
A database of known disposable domains, updated every hour from the main open-source sources.

### Real-time DNS analysis
Each domain is analyzed through its MX, SPF and DMARC records. A domain without SPF or DMARC, with a suspicious MX, receives a high score.

### MX Fingerprinting *(exclusive technology)*
Our algorithm identifies new disposable domains **before they even appear on a blacklist**, by analyzing their DNS infrastructure. If a new domain points to the same MX server as hundreds of known disposable domains, it is immediately flagged.

### Domain age
A domain created less than 24 hours ago with a complete email infrastructure is statistically suspicious.

## Risk score 0–100

Each analysis returns a score from 0 to 100:

| Score | Meaning | Recommended action |
|-------|---------|-------------------|
| 0–29 | Safe domain | Accept |
| 30–49 | Low risk | Accept with caution |
| 50–79 | High risk | Show a warning |
| 80–99 | Very likely disposable | Block |
| **100** | **Confirmed blacklist** | Block |

## GDPR compliance

Syvel is designed *privacy-first*:

- **Zero email storage**: only the domain is analyzed, never the full address
- **Hosted in France**: Scaleway / OVH, sovereign data
- **Logs max 90 days**: automatic deletion
- **Hash mode available**: send only the SHA-256 of the email (Pro plan and above)

## Ready to get started?

Head to the [Quick Start Guide](/guides/getting-started) to make your first API call in under 5 minutes.