The Email Domain Rule package for Laravel can define a subset of allowed email domains you can use within a validator. The email domains are stored in the database, and the accompanying validation rule uses the database to verify an email field:

 1use HFarmEmailDomainRuleEmailDomainRule;
 2use IlluminateSupportFacadesValidator;
 3
 4$email = 'my-email@example.com';
 5
 6Validator::make([
 7    'email' => $email,
 8], [
 9    'email' => [
10        'string',
11        'email',
12        new EmailDomainRule,
13    ],
14])->validated();

This package also has wildcard support, which can come in handy in a multi-tenant application where you’d like to constraint which domain(s) a user can register within a given tenant. The package readme illustrates model customizations you can use to make this package support validation for multiple tenants:

 1use HFarmEmailDomainRuleEmailDomainRule as BaseEmailDomain;
 2use IlluminateDatabaseEloquentBuilder;
 3
 4class EmailDomain extends BaseEmailDomain
 5{
 6    protected $fillable = [
 7        'domain',
 8        'tenant_id',
 9    ];
10
11    protected static function booted()
12    {
13        static::addGlobalScope('tenantAware', function (Builder $builder) {
14            $builder->where('tenant_id', auth()->user()->tenant_id);
15        });
16    }
17}

You can learn more about this package, get full installation instructions, and view the source code on GitHub.

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