gzt: Don't know. It would be surprising. Have you emailed them to ask in general about any restrictions? Are you getting a specific message or screen when you attempt to navigate to your webmail address and login?
Lastly, they do offer a separate global roaming service (through iPass) so if you get really stuck that would be a simple solution to get you in and take care of any outstanding business (@$24.95 per hour), and redirect everything to your gmail account.