Can receive but not send Outlook 2007 from Vista.

Hello, I checked many of the forums on this and tried many options with no success. I am setting up a Vista with Outlook 2007 with a new install. I am closing down an older desktop with XP. I am using bluehost as an email provider for many years. I have matched the Outlook settings from the XP to the Vista with no success. I can receive but cannot send on the Vista The error message is that outlook cannot log onto the outgoing smpt server. All bluehost settings are matched. No problem on the XP. Three weeks into this now. Any sp
ecific guidance would be appreciated.