Documentation

Crawlable docs for every WillItInbox workflow.

Start here for public, search-friendly documentation covering deliverability testing, validation, monitoring, DMARC, inbox placement, webhooks, SDKs, and the REST API.

Read API reference See examples

56+

deliverability checks

validation layers

API

first-class workflow

Start here

What WillItInbox helps you inspect

WillItInbox is built for teams that need to know whether email can reach the inbox before they ship a campaign, transactional flow, or list import.

Deliverability testing

Generate a real test inbox, send a message from your app or ESP, and inspect authentication, DNS, headers, content, and links.

Email validation

Classify addresses as valid, invalid, risky, catch-all, unknown, disposable, role-based, or typo-prone before a send.

Bulk CSV jobs

Upload lists, track progress, download enriched CSV output, and receive signed webhook callbacks when jobs finish.

Domain and DMARC monitoring

Verify sending domains, scan policy drift, ingest aggregate reports, label sources, and alert on alignment failures.

Developer surface

Docs are organized around workflows, not menus

Each guide explains the job, the evidence WillItInbox collects, the output a team should expect, and the next page to read.

REST API

Authenticated /api/v1 endpoints cover validation, bulk jobs, test inboxes, reports, webhooks, domains, DMARC, and usage.

SDKs

Dependency-light Node and Python clients live in the repo so teams can copy or package them quickly.

Webhooks

Bulk completion and monitoring workflows can POST signed events to your own endpoint for automation.

Fast paths

Most teams start with three pages

If you are new, read the deliverability testing guide, the email validation guide, and the API reference. Together they cover the message, the recipient, and automation.

Use /docs/deliverability-testing when you need to test a real sent message.
Use /docs/email-validation when you need to clean a list before sending.
Use /docs/api when you want repeatable tests, validation, reporting, and webhooks.

API reference

/docs/api

Email validation API

/solutions/email-validation-api

Sample report

/examples/sample-deliverability-report