If you already own a domain, we need to confirm it's yours before we can add it to your Pobox account.
If you don't use it for email, just point your MX records to Pobox before submitting your Add Domain request. Your domain will be confirmed immediately if the MX records are already in place.
If you use it for email, DON'T DO THAT! It could make email for your domain bounce while you get your addresses set up. Instead, just submit the Add Domain request. Our support staff will then be able to verify your domain manually.