---
title: "FAQ — EmailShield"
description: "Frequently asked questions about EmailShield."
canonical: "https://emailshield.co/faq"
last-updated: "2026-09-03"
---

> Frequently asked questions about EmailShield.

EmailShield [EmailShield](https://emailshield.co/)

FAQ

# Frequently asked questions

Common questions about EmailShield — answered.

How accurate is EmailShield verification?

EmailShield guarantees 99.8% verified accuracy across the standard inbox, business, and catch-all categories. Every address is processed through a four-stage pipeline before a result is returned.

Will verifying my list hurt my sender reputation?

No. EmailShield runs SMTP probes through a rotating pool of 1,200+ verification IPs that are isolated from any sending infrastructure. Your domain and sending IPs are never touched.

What's the difference between EmailShield and a single-stage verifier?

Most verifiers stop after a single SMTP handshake. EmailShield combines syntax/DNS checks, catch-all and disposable detection, careful SMTP probing, and historical inbox-rate scoring from a 1,200-domain network — producing a confidence score with explanations, not just a binary verdict.

How much does verification cost?

Pay-as-you-go pricing starts at $0.00018 per email, or choose a monthly plan from $19/mo for recurring volume. One credit is charged per valid email — invalid addresses and duplicates are free.

Do I get free credits to start?

Yes — every new workspace starts with free credits, so you can verify a real list before paying anything.

Is there a real-time API and SDKs for developers?

Yes. EmailShield offers a single REST API with an OpenAPI 3.0 spec, signed webhooks, and idempotent retries, plus SDKs for Python, Node, and PHP. Real-time checks return in under 2 seconds; bulk jobs process 100k+ emails per minute via webhook-driven async processing.

Where is my data processed, and is it shared with third parties?

Every list is verified on EmailShield-owned infrastructure with zero third-party calls — your data never leaves our network. It's encrypted both in transit and at rest.

How fast is verification?

Single email checks return in under 2 seconds, making real-time form validation possible. Bulk lists process at 100,000+ emails per minute via webhook-driven jobs — no polling required.