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Detect and block mailaddress.de emails
mailaddress.de is a known disposable email provider. Block it at signup with Fidro's API.
How to block mailaddress.de in your app
Add Fidro's email validation API to your signup flow. One API call detects mailaddress.de and 50,000+ other disposable domains in under 200ms.
curl -X POST https://fidro.io/api/validate \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "user{{ $entry->domain }}"}'
// Response:
{
"risk_score": 85,
"recommendation": "Block",
"checks": { "disposable_email": true }
}
// In your registration controller or form request
$response = Http::withToken(config('services.fidro.key'))
->post('https://fidro.io/api/validate', [
'email' => $request->email,
]);
if ($response['checks']['disposable_email']) {
return back()->withErrors([
'email' => 'Disposable email addresses are not allowed.'
]);
}
const res = await fetch('https://fidro.io/api/validate', {
method: 'POST',
headers: {
'Authorization': `Bearer ${process.env.FIDRO_API_KEY}`,
'Content-Type': 'application/json',
},
body: JSON.stringify({ email: req.body.email }),
});
const data = await res.json();
if (data.checks.disposable_email) {
return res.status(422).json({ error: 'Disposable emails not allowed' });
}
import requests
response = requests.post(
'https://fidro.io/api/validate',
headers={'Authorization': f'Bearer {FIDRO_API_KEY}'},
json={'email': email},
)
result = response.json()
if result['checks']['disposable_email']:
raise ValidationError('Disposable emails are not allowed')
Or try our free email checker to test any {{ $entry->domain }} address instantly.
What does this mean for developers?
mailaddress.de provides temporary, disposable email addresses that allow users to receive emails without revealing their real identity. These addresses are typically short-lived and self-destruct after a set period.
Users of disposable email services can sign up for your product, abuse free tiers, create multiple accounts, and disappear without a trace. This leads to inflated user counts, wasted resources, and increased fraud risk.
With a severity rating of 3/5, mailaddress.de represents a moderate risk. We recommend flagging or blocking signups from this domain depending on your use case.
Risk details
Developer resources for blocking disposable emails
Why Developers Should Block Disposable Emails at Signup
The risks disposable emails pose to your application and how to handle them.
TutorialDetect Disposable Emails in Your Signup Flow (Code Examples)
Step-by-step API integration for blocking fake signups in Laravel, Node.js, and Python.
ResearchThe True Cost of Fake Signups to Your SaaS
What we found analyzing 10,000 accounts created with disposable email addresses.
Free ToolEmail Validation API Checker
Test any email address for disposable status, MX records, and risk score.
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