On my Outlook Express, i can receive e-mails from people with Hotmail addresses, but I am unable to send them replies on their Hotmail addresses. The reply bounces back. I have no problems with sending or receiving any other emails that don't have Hotmail addresses.
Ok, if you can receive but cannot send, then you are not authenticating to your host. Double check all of your settings on your client (outlook express). Go to your provider for those settings.
