Disable account registering from disabled email provider

src/App/Users/Rules/EmailProvider.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Users\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+
+class EmailProvider implements Rule
+{
+    /**
+     * Determine if the validation rule passes.
+     */
+    public function passes($attribute, $value): bool
+    {
+        $providers = config('disposable-email-providers');
+        $provider = get_email_provider($value);
+
+        return ! in_array($provider, $providers);
+    }
+
+    /**
+     * Get the validation error message.
+     */
+    public function message(): string
+    {
+        return 'This :attribute email provider is not accepted.';
+    }
+}

src/App/Users/Rules/PasswordValidationRules.php

@@ -0,0 +1,15 @@
+<?php
+namespace App\Users\Rules;
+
+use Laravel\Fortify\Rules\Password;
+
+trait PasswordValidationRules
+{
+    /**
+     * Get the validation rules used to validate passwords.
+     */
+    protected function passwordRules(): array
+    {
+        return ['required', 'string', new Password, 'confirmed'];
+    }
+}