Disallow known throwaway email domains

2 data sources with updates.

.github/dependabot.yml

@@ -10,3 +10,7 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+  - package-ecosystem: "gitsubmodule"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/release.yml

@@ -23,6 +23,7 @@ jobs:
       with:
         # fetch full history so things like auto-changelog work properly
         fetch-depth: 0
+        submodules: true
     - name: Use Node.js ${{ env.node_version }}
       uses: actions/setup-node@v3
       with:

.github/workflows/tests.yml

@@ -16,6 +16,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+      with:
+        submodules: true
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v3
       with:

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "disposable-email-domains"]
+	path = disposable-email-domains
+	url = [email protected]:disposable-email-domains/disposable-email-domains.git

README.md

@@ -5,7 +5,7 @@
 [![downloads](https://img.shields.io/npm/dm/resolve-email.svg)](https://npmtrends.com/resolve-email)
 [![Socket Badge](https://socket.dev/api/badge/npm/package/resolve-email)](https://socket.dev/npm/package/resolve-email)
 
-Resolve the domain of a syntactically valid email address to see if there is even a chance of deliverability.
+Resolve the domain of a syntactically valid email address to see if there is even a chance of deliverability. Also checks against a large list of disposable email address domains and rejects those.
 
 ```
 npm install resolve-email
@@ -29,6 +29,11 @@ console.log(results)
 
 This module was adapted from [nodemailer/nodemailer-direct-transport](https://github.com/nodemailer/nodemailer-direct-transport/blob/v3.3.2/lib/direct-transport.js#L438)
 
+The disposable email domain list is generated from the following data sources:
+
+- https://github.com/romainsimon/emailvalid
+- https://github.com/disposable-email-domains/disposable-email-domains
+
 ## License
 
 MIT

build-throwaway-domain-list.cjs

@@ -0,0 +1,33 @@
+const { readFile, writeFile } = require('node:fs/promises')
+const { join } = require('node:path')
+const emailvalidDomains = require('emailvalid/domains.json')
+
+const disposableEmailDomains = new Set()
+
+const disposableEmailDomainsPath = join(__dirname, 'disposable-email-domains', 'disposable_email_blocklist.conf')
+
+readFile(disposableEmailDomainsPath, { encoding: 'utf-8' })
+  .then(async data => {
+    const disposableEmailDomainsRaw = data
+    const disposableEmailDomainsList = disposableEmailDomainsRaw.split('\n').slice(0, -1)
+    for (const domain of disposableEmailDomainsList) {
+      disposableEmailDomains.add(domain)
+    }
+  })
+  .then(async () => {
+    const disposableOnly = Object.entries(emailvalidDomains).filter(([domain, type]) => type === 'disposable').map(([domain, type]) => domain)
+
+    for (const domain of disposableOnly) {
+      disposableEmailDomains.add(domain)
+    }
+  })
+  .then(async () => {
+    return await writeFile('disposable.json', JSON.stringify(Array.from(disposableEmailDomains).sort(), null, ' '))
+  })
+  .then(async () => {
+    console.log('done')
+  })
+  .catch(err => {
+    console.error(err)
+    process.exit(1)
+  })

disposable.cjs

@@ -0,0 +1,3 @@
+const disposableArray = require('./disposable.json')
+
+module.exports.disposable = new Set(disposableArray)