# EmailScore (emailscore.io)
> Pre-Flight Email Hygiene & Edge Verification Middleware.

EmailScore is the "Pre-Flight Shield" (Filter #1) deployed upstream of heavy SMTP verification services (NeverBounce, ZeroBounce) and databases. It cuts verification bills by 40% while accelerating form validation to zero-latency (<0.3ms) by eliminating obvious junk at the perimeter.

## Core Positioning & Identity
- Category: Pre-Flight Email Hygiene / Edge Verification Middleware.
- Core Promise: Cut your email verification bill by 40% while speeding up form validation to zero-latency.
- Strategic Pillars:
  1. The "Trim the Fat" Economic Engine: Drop 35% of junk at $0.0001/check, making EmailScore pay for itself on day one.
  2. Zero-Latency Form Defense: Sub-0.3ms edge triage acting as an instant airlock on web forms without user friction.
  3. Complementary Middleware, Not a Replacement: Filter #1 sitting upstream of NeverBounce, SendGrid, and ZeroBounce.

## Key Technical Specifications
- Evaluation Latency: <0.3ms (<300µs in-memory, <5ms edge network), executed without blocking port-25 SMTP network probes.
- Benchmark Accuracy: 98.91% across 100,000 ground-truth evaluation emails (99.11% perimeter threat recall, 29.09% real bounce reduction).
- Batch Throughput: >3,200 emails / second via /v1/bulk API.
- Privacy Architecture: 100% stateless. Email addresses are scored in volatile memory and never persisted to disk. GDPR & CCPA compliant.
- Decision Framework: Calibrated 3-tier triage (ALLOW: 70-100 score, CHALLENGE: 40-69 score, DENY: 0-39 score).

## Core Capabilities
- Webmail Bot Detection: Markov bigram modeling and Shannon entropy analysis detect algorithmic throwaway accounts on major consumer webmail providers (Gmail, Outlook, Yahoo) that pass traditional SMTP checks.
- Disposable Domain Firewall: Sub-microsecond radix ledger indexing 50,000+ burner domains, 10-minute mailboxes, and temporary MX relays.
- Free Trial Abuse Defense: Subaddressing normalization (+tagging and dot-stuffing removal) coupled with SHA-256 identity fingerprinting to stop multi-accounting.
- Deliverability Hygiene: Syntax verification, MX routing health, and typo correction (e.g. gmial.com -> gmail.com).

## Key Developer & Product Resources
- [API Documentation & SDK Reference](https://emailscore.io/docs): Complete REST API guide, parameter reference, authentication, and status codes.
- [Empirical Benchmarks & Confusion Matrix](https://emailscore.io/benchmarks): 100,000 ground-truth evaluation dataset, methodology, and latency waterfall.
- [Pricing & Quotas](https://emailscore.io/pricing): Monthly subscription plans starting at 1,000 free checks/mo and PAYG credit packs that never expire.
- [Bulk CSV Cleanser](https://emailscore.io/clean): Web-based spreadsheet and contact list cleanser with zero data retention.
- [Master Comparison Hub](https://emailscore.io/vs): Architectural and performance comparisons against traditional SMTP verifiers.

## Architectural Comparisons
- [EmailScore vs AbstractAPI](https://emailscore.io/vs/abstractapi): Compare EmailScore against AbstractAPI. Discover why <0.3ms edge verification outperforms generalist 1,500ms enrichment APIs on the signup hot path.
- [EmailScore vs. BriteVerify](https://emailscore.io/vs/briteverify): Compare EmailScore against BriteVerify. Sub-millisecond execution, 100% stateless privacy, and upstream cost optimization that cuts verification bills by 40%+.
- [EmailScore vs. Clearout](https://emailscore.io/vs/clearout): Compare EmailScore against Clearout. Discover why <0.3ms edge execution and upstream cost optimization cuts verification spend by 40%+ while eliminating signup timeouts.
- [EmailScore vs. DeBounce](https://emailscore.io/vs/debounce): Compare EmailScore against DeBounce. Discover why <0.3ms edge execution, entropy-based webmail bot detection, and 100% stateless privacy outclass legacy verification.
- [EmailScore vs Hunter.io](https://emailscore.io/vs/hunter): Compare EmailScore against Hunter.io. Discover why <0.3ms edge verification protects signups and cuts verification bills while Hunter focuses on cold sales prospecting.
- [EmailScore vs. Kickbox](https://emailscore.io/vs/kickbox): Compare EmailScore against Kickbox. Sub-0.3ms edge execution without slow port-25 SMTP handshakes, combined with upstream cost optimization.
- [EmailScore vs. NeverBounce](https://emailscore.io/vs/neverbounce): Compare EmailScore against NeverBounce. Discover why <0.3ms edge execution and upstream cost optimization slashes verification bills by 40%+ while protecting deliverability.
- [EmailScore vs. ZeroBounce](https://emailscore.io/vs/zerobounce): Compare EmailScore against ZeroBounce. Sub-millisecond execution, 100% stateless privacy, and upstream cost optimization that drops 35% of invalid traffic before heavy SMTP checks.

## High-Intent Solutions
- [Bot Signup & Fake Account Prevention API (<0.3ms) | EmailScore](https://emailscore.io/solutions/bot-signup-prevention): Prevent fake account creation, automated bot signups, credential stuffing, and PRNG script accounts in real time. Sub-millisecond email validation API stops fake registrations before database insertion.
- [Disposable Email Address (DEA) API & Burner Blocker (<0.3ms) | EmailScore](https://emailscore.io/solutions/disposable-email-blocker): Block disposable email addresses (DEA), 10-minute mailboxes, and temporary MX relays at <0.3ms latency. Real-time zero-day burner domain intelligence with zero false positives.
- [Reduce Email Bounce Rate & List Hygiene API | EmailScore](https://emailscore.io/solutions/email-deliverability): Protect sender reputation and inbox placement. Clean invalid mailboxes, syntax errors, and dormant relays at 3,200+ checks/second. Reduce bounce rates below 1% on SendGrid, Mailchimp, and Klaviyo.
- [Stop Multi-Accounting & Free Trial Abuse API | EmailScore](https://emailscore.io/solutions/free-trial-fraud): Prevent free trial abuse, repeated promotional credit claims, and multi-accounting churn. Deterministic subaddress normalization (+tags and Gmail dots) and SHA-256 fingerprinting in <0.3ms.

## Optional
- [Full Knowledge Base](https://emailscore.io/llms-full.txt): Comprehensive technical specifications, multi-language code snippets, benchmarks, and pricing catalog.
- [OpenAPI 3.1 Specification](https://emailscore.io/openapi.json): Complete machine-readable OpenAPI REST definition.