Blog

Email verification guides, deliverability deep-dives, and product updates from the OpenGuardian team.

2026-01-15

What Is a Disposable Email Address? A Complete Guide

Temp-mail services let anyone create an inbox in seconds. Learn why they are a problem for signup forms and how to block them.

2026-01-22

Hard bounces, soft bounces, and the list-hygiene practices that keep your sender reputation clean and your deliverability high.

2026-02-05

Catch-all domains accept every email sent to them — which means you can never be sure an address on that domain actually exists.

2026-02-12

Fake trial signups skew activation metrics, waste sales outreach, and inflate infrastructure costs. Here is how to stop them at the source.

2026-02-19

Your 0–100 deliverability score is built from MX validity, SMTP response, domain reputation, and flag signals — explained in plain terms.

2026-03-01

When blocking role-based addresses helps (B2C signup) and when it hurts (B2B sales forms where a role inbox is the correct contact).

2026-03-08

Three authentication protocols that determine whether your email lands in the inbox or the spam folder — no jargon, just what you need to know.

2026-03-15

Webhook/API response models, latency budgets for signup forms, and why real-time and bulk checks solve different problems.

2026-03-22

A buyer's guide covering accuracy, latency, pricing models, integrations, and compliance — built to help you pick the right verifier.

2026-04-01

The three categories of spam traps, how each gets onto a list, and how risk scoring catches them before your campaign goes out.

2026-04-08

Step-by-step: export, bulk verify, segment by verdict, suppress vs. re-engage, then send with confidence.

2026-04-15

Short definitions of key deliverability and verification terms — SPF, DKIM, catch-all, spam trap, role-based, and more.