Thunderbird keeps refusing sending mail

System: MacOS 10.1, Thunderbird 1.0.7

Recieving is ok but if I want to send something everything fails. TB keeps 
asking me my password. Skipping password and username (to fill in later on) 
doesnot work. In the passwordmanager I find a different username from what I 
put in my server settings (name from my e-mail address instead of the 
correct one I filled in). I tried a lot of variables like skipping at leave 
the settings blank. Didn't work. There are people on Mac's working with TB 
and am I the only simpleton who can't get it working. Besides that there are 
some problems with newsfeeds.
Is there somebody somewhere to give me a clue/solution?
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Onraad

En toch hopen we dat B...bij zinnen komt...