Have a relatively new PowerBook G4 (had a Mac in the early 90's and then PC's for several years) and Entourage which I am using for mail and calendar. All if fine with both receiving and sending email from a wireless connection at home. But when I travel and connect to wireless or hotel DSL connections I can receive email fine, but whenever I try to send email I get an error message saying "Authentication failed because Entourage does not support any of the available authentication methods."

I would greatly appreciate if anyone has dealt with this or has any ideas of how to trouble shoot this.