Please help, this is hurting my business terribly. I do not receive an alert that my mailbox is full. Clients sending me emails received the following message.

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  *** Email address is removed for privacy ***
    mailbox is full: retry timeout exceeded

I have 238 emails in my inbox. My inbox total size including subfolders is 188557 KB. I have deleted everything from my trash. I have absolutely no idea how many emails I have not received or how much business I have lost because of this. Any help is greatly appreciated.

Sincerely,

Kara