Google Postmaster Tools

Google's free inbox reputation data for senders to Gmail.

Visit Google Postmaster Tools Start free with MailKite

How MailKite fits

Postmaster Tools shows your Gmail reputation. MailKite aligns the DNS that drives it.

Send email from Google Postmaster Tools with MailKite

A minimal, copy-paste starter. Swap in your own domain and API key.

send.ts

import { MailKiteClient } from "@mailkite/client";

// One API, your own DKIM-signed domain — no mail server to run
const mailkite = new MailKiteClient({ token: process.env.MK_API_KEY! });

await mailkite.send({
  from: "you@yourdomain.com",        // any address on a verified domain
  to: "user@example.com",
  subject: "Hello from Google Postmaster Tools",
  html: "<p>Sent in milliseconds via MailKite.</p>",
});

Read the sending quickstart

Google Postmaster Tools is a free dashboard from Google showing spam rate, IP/domain reputation, delivery errors, and SPF/DKIM/DMARC success for senders to Gmail users. Required reading since Gmail's 2024 sender requirements; has an API since 2021.