Simple way to filter out most of the disposable / temporary emails

verify-email.js

import TTLCache from "@isaacs/ttlcache"
import axios from "axios"

const domainsCache = new TTLCache({
  ttl: 1000 * 60 * 60 * 24, // cache for 24h
})

const lists = [
  "https://raw.githubusercontent.com/wesbos/burner-email-providers/master/emails.txt", // submiting my findings here
  "https://raw.githubusercontent.com/Igloczek/burner-email-providers/master/emails.txt", // adding my fork, as sometime PRs are stuck unmerged
  "https://raw.githubusercontent.com/7c/fakefilter/main/txt/data.txt",
  "https://raw.githubusercontent.com/unkn0w/disposable-email-domain-list/main/domains.txt",
  "https://raw.githubusercontent.com/disposable/disposable-email-domains/master/domains_strict.txt",
  "https://raw.githubusercontent.com/disposable-email-domains/disposable-email-domains/master/disposable_email_blocklist.conf",
]

async function loadDomains() {
  const cached = domainsCache.get("domains")

  if (cached) {
    return cached
  }

  const domains = new Set()

  await Promise.allSettled(
    lists.map(async (list) => {
      const response = await axios.get(list)

      response.data.split("\n").forEach((item) => {
        const line = item.trim()

        if (line !== "" && !line.startsWith("#")) {
          domains.add(line)
        }
      })
    }),
  )

  domainsCache.set("domains", domains)

  return domains
}

// warm up the cache
await loadDomains()

// import this function whenever you need to check user email, for example before creating an account
export async function verifyEmail(email) {
  const domains = await loadDomains()
  return !domains.has(email.split("@")[1])
}