I thought that under the Data Protection Act by Law Orange would be required to delete personal information they held on you when it was no longer needed. If they no longer have a commercial relationship with you (ie you aren't using their dial up service or paying them any money) then I would expect that they delete the email and failing to do so would be illegal.

I don't understand why people are expecting that an ISP they no longer use should still provide them email access. They are a business not a charity