BB Curve :: Access To POP3 E-mail Not Working?

I have a Curve which is on a consumer account (o2 UK). It is not a business account, not using exchange and not requiring any particular security.My BB will access an O2 e-mail account but not a particular account which I own.O2 tell me that the reason I cannot access it is that the e-mail account is set up in such a way that BB has treated it as a business account, and is applying Exchange security to its access. O2 believe that this account is registering with BES.s a consumer O2 believe my access should be through BIS. They are unable to tell me what setting at my e-mail host would cause the Blackberry servers to pick it up wrongly. They tell me the problem is outside my control. My e-mail hosts don't understand the problem either. If I could tell them what to change, they would try to do it.

So my questions are:- 1) Does anyone know if there is a setting at my hosts that would change things so that my e-mail address is treated like any other POP3 or alternatively 2) is there something that I can do in the Blackberry world that will move / recategorise my e-mail service correctly.