Reputation monitoring integration

Without programmatic integration with Google Postmaster Tools or Microsoft SNDS, you learn about reputation problems by noticing a drop in open rates — days or weeks after the damage occurred. Postmaster Tools reports domain reputation (high/medium/low/bad), IP reputation, DMARC pass rate, and spam classification rate for Gmail traffic. Microsoft SNDS reports IP reputation and complaint rates for Outlook. Both platforms provide the earliest warning signal available before inbox filtering escalates to blocking. Manual monitoring via dashboard login means the signal arrives too late and only when someone remembers to check.

Integrate with the Gmail Postmaster Tools API using googleapis and store the fetched stats in your database. Run this on a daily cron via Vercel or a queue worker:

import { google } from 'googleapis'

const postmaster = google.gmailpostmastertools('v1')

export async function fetchDomainReputation(
  domain: string,
  auth: OAuth2Client
): Promise<void> {
  const dateStr = new Date().toISOString().slice(0, 10).replace(/-/g, '')
  const response = await postmaster.domains.trafficStats.get({
    name: `domains/${domain}/trafficStats/${dateStr}`,
    auth
  })
  await db.domainReputation.upsert({
    where: { domain },
    update: {
      spamRate: response.data.spamRate ?? null,
      dkimPassRate: response.data.dkimSuccessRatio ?? null,
      updatedAt: new Date()
    },
    create: { domain, updatedAt: new Date() }
  })
}

For Microsoft SNDS, register your IP ranges at postmaster.live.com and poll the CSV API endpoint. Alert when domain reputation drops below HIGH or IP reputation category turns Yellow.