What the hell is this - what's the difference between negative & positive

You are currently exceeding your Yahoo! Mail storage quota by a very
large amount. You are only allowed -2048.0MB of storage but you are
currently using 0.0MB of storage. Your account has been temporarily
disabled from receiving new messages.

The easiest action to take is to delete some of your email. You may want
to start with older email, or email with large attachments. Please
remember, however, that once you delete a message, it is gone forever.

To delete email, simply go to the BT Yahoo! Mail website, sign in to
your account, check the messages you want to delete, and click the
"Delete" button at the top or bottom of the page. Then, be sure to empty
your Trash folder by clicking on "Empty" next to your Trash folder on
the left side of your Mail inbox or home page

We recommend that you keep at least 1 MB of free space in your BT Yahoo!
Mail account to make sure you can receive incoming email. You can view
the amount of storage space you are using by reading the storage meter
on the right side of any Mail page.

If you use a POP3 client to read your mail, you may want to configure it
to "Delete messages from the server" when retrieving your BT Yahoo!
Mail. Check the help files for your POP3 client if you need assistance
in setting this up.


Sincerely,
The BT Yahoo! Mail Team

 

There's a follow up email explaining that this was set in error.

 

"set" or "sent" in error

Uncle TOM