Im hoping there is someone on this forum that will be able to help me. I joined a couple groups on Upoc and I have never been able to reply to the groups. If I want to send a message I have to go online and reply, which is a pain. When I try and send a message to the email for the given group I receive a message saying "Could not send message. The message center number or the email center number is invalid. Please contact the wireless operator."

I have no problem receiving messages, it is just when I try and reply. If anyone can help me out it would be greatly appreciated.