Deliverability insights
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Ghost Blog Email Deliverability: Are Your Newsletters Reaching Subscribers?
Ghost uses Mailgun under the hood for members. Placement varies wildly by domain. Seed-test every issue; join the Ghost plugin beta.
Drupal SMTP Module + Inbox Placement: Complete Guide
The Drupal SMTP module handles auth but not placement. Configure properly, then run a seed test. Full Drupal walkthrough.
Drupal Email Going to Spam: How to Diagnose and Fix
Drupal sites often send from PHP mail on the web host. That is almost guaranteed spam placement. Diagnose, fix, seed-test.
Joomla SMTP Configuration and Inbox Placement Test
Joomla needs SMTP + DMARC + a warm IP for any hope of inbox placement. Config walkthrough + seed-test at the end.
Joomla Email Deliverability: Why Your Site Emails Go to Spam
Joomla ships mail via PHP mail by default. SPF breaks, DKIM missing — spam nearly guaranteed. Diagnose, fix, join the Joomla extension beta.
WordPress + Mailchimp/Brevo: Test Deliverability of Your Newsletter Plugin
Newsletter plugins on WordPress route through Mailchimp or Brevo. The plugin hides the important knobs. Seed-test from outside to see the truth.
Contact Form 7 Emails Going to Spam: The Fix Nobody Talks About
CF7 triggers wp_mail which triggers PHP mail. That path produces spam. Install an SMTP plugin + seed-test. Full fix list.
Elementor Forms Email Deliverability: Why Submissions Disappear
Elementor forms rely on wp_mail. Without SMTP + DNS, submissions silently land in spam — or nowhere. Diagnose and fix with the free tester.
WordPress Multisite Email Deliverability: One Test for All Your Sites
Multisite networks often share a sending domain. A single placement issue affects every tenant. Centralised seed testing catches it once.
Gravity Forms + Inbox Check: Test Notifications Before They Go Live
Gravity Forms is the go-to premium forms plugin. Seed-test notifications before publishing; beta Gravity integration waitlist open.
WordPress Transactional Emails: Are Password Resets Hitting Spam?
WordPress password reset emails are the most important transactional email your site sends. They also go to spam most often. Test and fix.
WP Mail SMTP vs FluentSMTP vs Post SMTP: Which Actually Reaches Inbox?
The three leading WordPress SMTP plugins compared on real inbox placement — not just on "delivered to SMTP server".
How to Test If Your WordPress Emails Reach Inbox (Free, No Plugin)
You do not need to install a plugin to test placement. Use our free tester on top of any WordPress install. 2-minute walkthrough.
WordPress Email Deliverability Plugin: Test Inbox Placement From Dashboard (Beta)
Native WordPress plugin in private beta — run inbox placement tests from your wp-admin and alert on drops. Join the waitlist here.
WooCommerce Order Emails Going to Spam: How to Test and Fix
WooCommerce order emails hit spam surprisingly often — PHP mail, shared IPs, missing DNS. Full diagnosis + seed-test walkthrough.
Best WordPress SMTP Plugins 2026 — and Why They Do Not Check Inbox Placement
The top WordPress SMTP plugins reliably hand email to Mailgun/SendGrid/SES. None of them verify where the mail actually lands. Seed-test separately.
Postman Collection for Inbox Check API: Test Every Endpoint in 5 Minutes
Import one JSON file and hit every Inbox Check endpoint — auth, create test, poll, webhook verify, quota — without writing a line of code.
Slack Bot for Inbox Placement Alerts: Get Pinged When You Drop Below 80%
A 40-line Slack bot that watches your Inbox Check results stream and posts to a channel when inbox rate dips under a threshold. Full code included.
Grafana Dashboard for Inbox Placement Monitoring (JSON + API)
Scrape Inbox Check's API into a Grafana panel for per-provider inbox rate, DMARC alignment and DNSBL counts. The JSON dashboard to import.
Terraform Provider for Email Deliverability (Concept and Early Spec)
What a Terraform provider for Inbox Check would look like: resources for tests, schedules, webhooks, and why infra-as-code belongs around email too.
GitHub Actions: Test Email Deliverability on Every PR
Drop a single workflow file in .github/workflows. Every PR that touches your email templates or DNS now triggers a placement test and posts results.
Make.com (Integromat) + Inbox Check: No-Code Deliverability Monitoring
A no-code scenario that fires a placement test whenever a campaign is queued and posts the verdict to Airtable. Step-by-step walkthrough.
n8n + Inbox Check: Self-Hosted Email Deliverability Automation
Self-host n8n, wire it to Inbox Check, and run scheduled placement tests with Slack alerts — all without SaaS lock-in. Full workflow JSON.
Zapier Integration: Trigger Inbox Placement Tests From Any Workflow
Connect Inbox Check to Zapier: new Klaviyo campaign → placement test → Slack alert if spam rate > 20%. A 5-minute no-code setup.
Inbox Check Node.js SDK: npm install inbox-check (Full Reference)
The complete Node.js SDK reference — constructor options, tests.create, tests.get, tests.stream, webhooks, retry+timeout, TypeScript types.
Inbox Check Python SDK: pip install inbox-check (Full Reference)
Every method, every kwarg, every return type. The Python SDK reference — sync and async clients, pydantic response models, retry strategy.
Status Page and Incident History: Full Transparency on Uptime
Our public status page, the incidents we've had, how long we took to recover, and the postmortems behind each one.
Monitoring Our Own Deliverability: Eating Our Own Dog Food
Our transactional and marketing mail runs through Inbox Check every day. The dashboards we watch, the thresholds we alert on.
How We Process 1,000 Tests/Day on a Single Server (Architecture Post)
Postgres, BullMQ, Puppeteer, headless Gmail/Outlook sessions on one box. The architecture that keeps Inbox Check free and fast.
Seed Mailbox Rotation: How We Keep Test Results Accurate
Why seed mailboxes go stale, how we detect it, and the rotation process that keeps each provider's filter unbiased against test senders.
Infrastructure Behind Inbox Check: How We Maintain 20+ Seed Mailboxes
Real mailboxes on Gmail, Outlook, Yahoo, Mail.ru, Yandex, GMX, Orange, ProtonMail and more. The boring, expensive infrastructure few tools bother with.
Why We Do Not Gate the Free Tier Behind Email Verification
Every other deliverability tool asks for your email before you see your own DNS. We don't. Here is why — and the business math behind it.
Our Free Tier SLA: 99.9% Uptime, Sub-2-Minute Results, No Signup
A free tool does not have to mean a flaky tool. Here is our free-tier SLA, the infrastructure behind it, and where the paid tier adds real value.
The Future of Email Deliverability: AI Agents, MCP, and A2A
Where deliverability tooling is heading as AI agents become the primary consumer. MCP, A2A, and the end of the static dashboard.
AI Agents That Check Email Deliverability Autonomously (A2A + MCP Demo)
A working demo: an AI agent discovers our deliverability tools via A2A, runs a placement test through MCP, and diagnoses the failure on its own.
A2A Agent Discovery: .well-known/agent.json Explained
The .well-known/agent.json spec, how peer agents discover your capabilities, and the security considerations nobody covers yet.
How to Register Your Service as an A2A Agent (Step by Step)
Publish a valid Agent Card, expose a compliant endpoint, handle authentication — the full checklist to register with the A2A ecosystem.
Building a Multi-Agent Email QA Pipeline With A2A
A reviewer agent, a deliverability agent, a DNS agent — three agents coordinating over A2A to QA every email you send. Architecture + code.
A2A vs MCP: Which Protocol to Use for AI Agent Integrations
Both protocols matter — but for different things. MCP lets a model call your tools. A2A lets two agents talk. Here is when to use each.
A2A Agent Card for Email Testing: How Peer Agents Discover Our Tools
Our Agent Card at check.live-direct-marketing.online/.well-known/agent.json — the capabilities it advertises, the auth flow, example peer calls.