Introduction

DISIFY checks email syntax, mail DNS, and disposable-address indicators. Use it in sign-up forms, waitlists, and imports. Core checks work without an account or API key, subject to rate limits and quotas.

What it does

Capability	Description
Disposable detection	Checks known disposable domains, subdomains, and mail servers, plus heuristic signals.
Format & DNS validation	Checks syntax and whether mail DNS can be resolved. This does not verify mailbox existence or ownership.
Plus-alias detection	Catches temp-mail services that hand out +alias addresses on real Gmail / Outlook / iCloud mailboxes.
Confidence scoring	Provides a 0–100 detection score and supporting signals alongside the verdict.
Premium checks	SPF / DKIM / DMARC, domain age, inbox provider, deliverability score, and spam-trap detection (Pro tier).
Bulk validation	Checks lists of emails or domains, synchronously or as queued jobs. Limits depend on your tier.

How detection works

The API combines domain checks with per-email detection:

1. Format check — syntax validation for the email or domain.
2. Domain checks — trusted-provider handling, blacklist matches, patterns, keywords, and entropy signals.
3. Mail DNS — MX hostnames and IPs are checked for disposable infrastructure.
4. Per-email checks — known base-account matches and alias patterns are evaluated even on trusted providers.
5. Result — read disposable as the final verdict, with confidence and signals as context. A provider whitelist does not override an individual disposable verdict.

See Confidence Scoring and Detection Signals for the full model.

Base URL

Email, domain, and bulk-validation requests use this base URL:

https://disify.com/api

Single checks return JSON. The bulk result viewer returns JSON progress or a plain-text result list. Public blacklists are plain text at https://disify.com/blacklist/, outside the API base path.

CORS permits anonymous browser requests. Use backend requests for enforced validation and keep API keys server-side. Always check HTTP status before interpreting a result; see Error Handling.

Next steps

• Quick Start — make your first request in seconds.
• Integrate with an AI Agent — a copyable setup prompt and test cases.
• Authentication — API keys and usage tiers.
• API Reference — every endpoint, parameter, and response field.