API & Integrations

Sendability API. Connect your stack in minutes.

REST API for email verification, deliverability intelligence, and infrastructure orchestration. EU-hosted. GDPR-native. Sub-100ms response time. Works with any ESP, CRM, or form builder.

Get API Access Partner Program

Used in production at 1B+ emails/month. Enterprise SLAs available. EU-hosted, GDPR-native.

Core API endpoints

All endpoints return JSON. Authentication via API key. Base URL: https://api.sendability.com/v1/

Email Verification

POST /verify/email

Real-time email validation. Returns: Valid / Greylist / Invalid. Includes sub-classification: disposable, catch-all, spam-trap, syntax-error, dns-fail.

Sub-100ms average response
Historical intelligence scoring from 20B+ emails
Disposable provider detection (40,000+ providers)
SEG-aware catch-all probing

Domain Intelligence

POST /verify/domain

Domain-level risk classification. DNS signals, historical sending patterns, reputation data from 20B+ email history.

MX / SPF / DMARC validation
Domain age and registrar signals
Historical delivery pattern scoring
Bulk domain analysis supported

Batch Validation

POST /verify/batch

Validate up to 10,000 emails per request. Async processing with webhook callback. Ideal for list cleaning before a campaign or migration.

Up to 10K emails per request
Webhook callback on completion
CSV export available
Automatic deduplication

Deliverability Score

GET /reputation/domain

Domain-level sending reputation score based on live MBP signals. Gmail, Outlook, Yahoo inbox placement indicators updated every 24h.

Per-MBP reputation breakdown
30-day rolling trend data
Actionable recommendations
Enterprise plans: real-time webhooks

Quick start

One API call. One JSON response. Works in any language. Get your key from the client portal.

Request

curl -X POST \
  https://api.sendability.com/v1/verify/email \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"email": "user@example.com"}'

Response

{
  "email": "user@example.com",
  "status": "valid",
  "score": 94,
  "sub_status": null,
  "disposable": false,
  "catch_all": false,
  "historical_flags": 0,
  "response_time_ms": 47
}

SDKs available for Python, Node.js, and PHP. WordPress and Webflow plugins available on request.

Get Your API Key

Pre-built connectors

Native integrations for the tools you already use. No custom development required for the most common stacks.

✉ Mautic

Native integration included in all Sendability plans. Real-time validation at form submission, automated list hygiene, and bounce management built in.

Included in all plans

📨 Mailchimp

Validate contacts before importing to Mailchimp. API bridge for deliverability intelligence overlay on existing Mailchimp sending accounts.

Available via API

📈 HubSpot

CRM data quality layer. Validate contacts at form capture, flag risky emails as HubSpot properties, trigger automated cleanup workflows.

Available via API

⚡ Klaviyo

List validation before campaigns. Historical intelligence scoring applied to existing Klaviyo lists. Reduce bounce rates on first send after import.

Available via API

🎯 Salesforce MC

Enterprise deliverability intelligence layer for Marketing Cloud. Per-MBP reputation data, spam trap alerts, and catch-all domain management at scale.

Enterprise plans

🔗 Custom Webhook

REST API works with any platform. JSON-in, JSON-out. SDKs for Python, Node.js, PHP. Form builder plugins for WordPress and Webflow available on request.

Available via API

Ready to connect?

Get your API key and start validating in under 10 minutes.

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Building something custom? Talk to our partnerships team →