Practical explainers on disposable email detection and email verification.
Zapier email validation in one webhook step: POST each new signup to the check endpoint, filter on the returned action, and block disposable emails in Zapier for Typeform, Mailchimp, Google Sheets, or any trigger app, with warn and relay variants included.
Guides7 minute read
"Do not block Apple Hide My Email. Relay addresses forward permanently to real people, so blocking privaterelay.appleid.com signups filters out privacy conscious paying customers while stopping no abuse. Here is the mechanical case, and the right way to handle relays.
Guides8 minute read
Block disposable emails on Shopify where the platform actually allows it: gate customer registration and newsletter forms with one snippet in the theme editor, flag fake customer accounts with Shopify Flow, and keep every path failing open so a sale is never lost to Shopify email validation.
Guides8 minute read
Your email bounce rate is one of the loudest list-quality signals you emit, and the reputation it damages first is with your ESP, not Gmail. Hard bounce vs soft bounce, where the thresholds really live, where bounces come from, and how to reduce email bounce rate at the signup form.
Guides8 minute read
Block disposable emails in Bubble with the API Connector: exact call configuration, a signup workflow branched on allow, warn, and block, plus the drop-in snippet path and backend workflows. Bubble email validation that fails open and never breaks a signup.
Guides8 minute read
The cost of fake signups, line by line: wasted email spend, burned support time, abused trials, corrupted metrics, and ESP risk, with a worked example for a mid-size SaaS and a calculator to run your own numbers.
Guides8 minute read
Block disposable emails on Webflow with one script tag in your site's custom code, no backend required. The snippet path for no-code builders, a small intercept script for the technical tail, and a Make or Zapier route for webflow email validation downstream.
Guides8 minute read
New disposable email domains appear by the hundreds every day. Measured data on how throwaway providers rotate domains, the cheap TLD economics behind it, the graveyard it leaves behind, and why static blocklists cannot keep up.
Guides18 minute read
Block disposable emails in Node.js and Express two ways: the official disposable email checker npm package or a raw fetch against the API. A copy-pasteable Express email validation middleware that gates signup, fails open, and never blocks relay addresses.
Guides16 minute read
Free disposable email domains lists versus a live detection API: an experienced deliverability practitioner compares freshness, coverage, MX validation, and relay handling with measured September 2026 data, plus the real cost of maintaining your own list.
Guides22 minute read
A null MX record (RFC 7505) is how a domain declares it accepts no email. Here is the exact MX 0 . syntax, the SMTP codes it triggers, and why a domain with no MX record is not the same as an invalid address.
Guides19 minute read
Block disposable emails in Django two ways: with the official isitdisposable Python SDK or a direct API call. Forms, a reusable validator, Django REST Framework, django-allauth, fail-open handling, and relay support, in copy-pasteable Python.
Guides23 minute read
Block disposable emails in Next.js in two ways: with the official isitdisposable JavaScript SDK or a hand-rolled fetch. Server Actions, Route Handlers, a fail-open wrapper, client feedback, relay handling, and the Pages Router, in copy-pasteable TypeScript.
Guides27 minute read
A practitioner's guide to disposable email detection: how it works, why disposable bounces don't hurt your Gmail reputation, and how to filter burner signups without blocking real customers.
Guides20 minute read
A plain language walkthrough of disposable email addresses, how Domain Name System (DNS) based detection tells them apart from real inboxes, and why isitdisposable.com never contacts a mailbox directly.
Guides7 minute read