Parse customer emails into clean Markdown webhooks engineered for LLMs and AI workflows
Stop wrestling with 2MB multipart MIME payloads, nested blockquotes, and broken regex parsers. Point your MX records to inbound.sadasend.com and receive structured JSON with clean Markdown text, sanitized attachments, and pre-send prompt injection risk scoring.
Drop into your application in under 60 seconds
Native typed interfaces with zero unnecessary dependencies. Built for standard fetch and modern edge runtimes.
{
"messageId": "msg_9f82a10b4c7d",
"from": "sarah.connor@enterprise.com",
"to": "support@inbound.yourcompany.com",
"subject": "Re: Invoice #1042 discrepancy",
"cleanMarkdown": "Hi Team,\n\nWe noticed a billing error on line item 3. Can you adjust this to 15 seats instead of 20?\n\nThanks,\nSarah",
"security": {
"promptInjectionRisk": 0.02,
"quarantineRecommended": false
},
"rawHeaders": {
"Message-ID": "<CAL7x...mail.gmail.com>",
"Date": "Tue, 03 Nov 2026 10:14:00 GMT"
},
"signatureValid": true
}Structured inbound webhook payload dispatched to your endpoint. Notice the cleanMarkdown property, prompt injection threat evaluation, and signature verification.
Engineered for high deliverability and zero incident risk
Every layer from synchronous request validation to per-key rate limits is designed to keep critical transactional dispatches fast, reliable, and contained.
85% LLM Token Savings
Automatically strips redundant forwarded chains, corporate legal confidentiality disclaimers, and mobile signatures, converting the core message into token-efficient Markdown.
Prompt Injection Risk Scoring
Edge heuristics evaluate inbound text and HTML for system prompt override attempts, tagging quarantineRecommended: true if an adversarial prompt is detected.
Wildcard Subdomain Routing
Route exact addresses (support@yourdomain.com) or wildcards (*@inbound.yourdomain.com) directly to your webhooks with priority matching.
Cryptographic Signature Verification
Every inbound webhook carries an X-SadaSend-Signature-256 header, ensuring incoming payloads originate strictly from our verified gateway.
SadaSend vs Postmark & Mailgun Inbound
Why AI developers and modern SaaS engineering teams choose SadaSend for inbound email parsing over legacy MIME dumpers.
| Feature & Capability | SadaSend | Postmark & Mailgun Inbound |
|---|---|---|
| Webhook Output Format | Clean Markdown + Structured JSON | Raw Multipart MIME JSON (1–3 MB) |
| LLM Token Efficiency | ~85% Token Reduction | 0% (sends full MIME overhead) |
| Inbound Prompt Injection Scoring | ||
| Interactive Inbound Webhook Simulator | ||
| Free Tier Inbound Allowance | Included in 6,000 monthly sends | Charges extra per inbound message |
Verified as of November 2026. Competitor features and pricing are based on public documentation and may vary.
Start with 6,000 emails every month at zero cost
No artificial paywalls on security. Unlike providers that reserve recipient allowlists and approval workflows for enterprise tiers, every SadaSend account receives full safety controls from day one.
Everything you need to know about inbound email parsing API
Clear, transparent answers on deliverability, API authentication, and rate limits.
Related developer guides and architectural tutorials
Explore step-by-step production implementation blueprints, benchmarks, and protocols.
REST API Reference & Endpoints
Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.
Inbound MX Routing & Token-Optimized Webhooks
Configure dedicated inbound MX records, route messages by exact address or wildcard patterns, and receive clean Markdown webhooks with ~85% LLM token savings.
Model Context Protocol (MCP) Server
Connect AI agents directly to SadaSend via Model Context Protocol (MCP). Inspect tools, configure execution scopes, and enable human approval holds.
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