BigShield Blog

Deep dives into email validation, fraud detection, and keeping fake signups out of your application. Written for developers and security teams.

Problem8 min read

Are Fake Emails Inflating Your Mailchimp Bill?

ESPs charge by subscriber count. If 10 to 20 percent of your list is fake or dead addresses, you are overpaying every month and tanking your deliverability at the same time.

Mar 28, 2026

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Developer10 min read

How to Validate Email at Signup in Node.js

A practical guide to adding real email validation to your Node.js signup flow. Goes beyond regex to cover DNS checks, disposable detection, and API-based validation with code examples.

Mar 28, 2026

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Developer9 min read

How to Detect Disposable Emails with an API

Static blocklists and regex patterns miss most disposable emails. Learn how to detect burner addresses reliably using API-based validation, with Node.js code examples and a step-by-step integration guide.

Mar 25, 2026

Solution10 min read

Best Email Validation APIs for AI Apps in 2026

A developer-focused comparison of six email validation APIs for AI applications. Transparent criteria, real pricing, and honest takes on who each one is actually best for.

Mar 25, 2026

Problem6 min read

Why Email Validation Alone Isn't Enough to Stop Signup Fraud

MX records and SMTP checks catch obvious fakes, but valid-but-fraudulent emails, compromised accounts, and aged burner domains slip right through. Here is why multi-signal validation is essential.

Mar 24, 2026

Problem7 min read

Stop Free Trial Abuse in Your SaaS App

Free tier abuse costs SaaS founders thousands per month in wasted tokens, inflated ESP bills, and corrupted metrics. Here is how to fix it without CAPTCHAs.

Mar 19, 2026

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Developer8 min read

How to Stop People Gaming Your Free Tier

Traditional defenses like IP blocking, domain blocklists, and CAPTCHAs fail against modern free-tier abuse. Here is a practical developer guide to building real signup protection with scoring, signals, and a single API call.

Mar 19, 2026

Problem9 min read

Free Tier Abuse Is Costing AI Startups Thousands. Here Is the Fix

A detailed cost breakdown of what fake signups really cost AI SaaS companies: wasted tokens, inflated ESP bills, Stripe overhead, and engineering hours. The math says prevention is 50-100x cheaper than the fraud itself.

Mar 19, 2026

Solution9 min read

BigShield vs IPQS: A Detailed Comparison for 2026

An honest comparison of BigShield and IPQualityScore (IPQS) across pricing, signal coverage, custom rules, dashboard features, API performance, and developer experience for email validation and fraud prevention.

Mar 18, 2026