Hi
I've, finally, solved this for me. This may help others.
The settings, Diane suggested, were the problem. The issue is that the settings that worked for Entourage on my MacBook Air don't work for Entourage on the MacBook Pro.
I use Yahoo bizmail and the setting for user ID that works on the MacBook Air excludes the '@xxx.com' part of the email address, when I included this in the Entourage setting on the MacBook Pro .... 'bingo!'
I don't know if this will help anyone else but hope it's some use (and I sure don't know why it works
)
All the best
Cannot get entourage to send emails. Inbound is OK.