We sincerely apologize that you have had to deal with this. Email issues can happen for a number of reasons, from the storage limit reached, third-party email service settings being input incorrectly, or even server issues. When this happens, it is best to contact Dynadot through chat or to send us an email so we can assist directly, as all situations can be unique. https://www.dynadot.com/community/about/contact.html