Thank you. That helps. According to the information I found, BT Broadband gives you a choice of either using a client based email like Outlook Express, or their web-based email. First, I want you to check the screen shots below and make sure the account for OE is set up correctly:
http://www.pdoc.co.uk/screenshots/oe_for_bt.htm
NOTE: a comment is made that 'wanadoo' may not be the domain and that it is used as an example, so substitute your particular domain if it is not.
While you're in the mail account screen, click on the Advanced tab> Delivery Section: IF you have checked 'leave copy of mail on server', you are going to have to also check 'remove mail from server when mail is deleted from the Deleted Items box'. This allows you to stay within the storage limit set by the ISP. IF you do not and the mail hits the limit, you are going to have problems. When I get a 'screenful' of mail in the Deleted Items box I click on Edit> Select All> Delete
When you have finished with the OE settings> Apply> OK.
This feature is handy to those of us who have more that one computer and want to be able to access the mail from any computer in OE. But is can have it's drawbacks if not cleaned up. So if you do not need this feature, uncheck it.
Call the ISP and ask them what the web mail address is. Then you need to access that with your email name and password and delete all of the mail there-download the current mail first, then do the delete.