[Stu]

If they are surcharging e-mail, they are probably looking at the standard POP3, IMAP, and probably Activesync ports. If you set up a VPN or find alternate ports for your mail server, it will be harder (but not impossible) for Orange to identify your behavior as retrieving e-mail. On Microsoft push devices, it would be child's play to set up a PPTN VPN and run your e-mail retrieval through that.