DELIVERABILITY
DNS & IP
GENERATORS
Practical guides on verification, deliverability, and email authentication — from the team building the tools.
DeliverabilityYour MX record decides whether inbound email reaches you or vanishes. This guide shows you how to read one, spot routing problems, and fix the silent sender reputation damage most guides miss.
Email ValidationAn email validator runs every address through 11 checks before you send. This post breaks down each stage, explains the 10 possible statuses you'll get back, and gives you a decision tree for what to
Email MarketingAI can generate email copy. What it can't do is verify your list is real. Here are four prompt templates that work, plus why verification is the step that separates a 0.5% bounce rate from a 14% disas
Email ValidationEvery verifier charges for Unknown results. Valid Email Checker refunds them automatically. Here's how that changes your true cost-per-verification on lists with high catch-all rates.
DeliverabilityGmail caps attachments at 25 MB. A single minute of 4K video can hit 400 MB. But the real problem isn't the workaround — it's that a bounce from an oversized file counts against your sender reputation
Email ValidationAI cold calling scales your outreach volume, but it won't save a rotten contact list. Here's how to verify list quality before your first AI call.
Email MarketingCold email works when your list is clean. Most outreach guides skip the bounce-rate math that determines campaign viability. Here's what happens to sender reputation when you verify before send — and
DeliverabilitySpam filters score your messages across a dozen signals at once. This post walks you through the diagnostic sequence — authentication, list quality, content — with the specific thresholds Gmail and Ya
DeliverabilityYou can hit a 98% delivery rate and still have a third of your list never see a single message. The gap between server acceptance and inbox placement is where most sending programs bleed revenue — and
DeliverabilityEvery email you send triggers an MX record lookup. Understand what MX records do, why priority matters, and how a broken record cascades into hard bounces and damaged sender reputation.
Email ValidationEmail verification has a reputation problem. Not because it doesn't work, but because vendors, competitors, and bad experiences have led you to believe myths about what it can actually do. Here's what
Email ValidationList hygiene isn't a purge—it's the ongoing practice of keeping every address worth sending to. This guide maps each of the 10 verification outcomes to a concrete next action: send, suppress, investig
Email ValidationDisposable addresses tank your bounce rate and sender reputation. This guide covers detection, suppression strategy, and the critical distinction between true throwaway inboxes and legitimate privacy
Industry NewsSearch 'cold email news' and you get beginner guides and outdated Reddit threads. This is the briefing that doesn't exist: regulatory changes, deliverability shifts, and the infrastructure step seriou
Email ValidationEmail verification goes beyond syntax checks. This guide walks you through all 11 stages, explains what each result means for your sender reputation, and shows you exactly which addresses to suppress.
