Cannot Send Ichat Or Mail


I am on OS 10.4.1
Mail version 2.0.1
PBG4 12" 1.5ghz

I can recieve mail, but cannot send. The outgoing mail server is correct, but when I look at mail>preferencec>accounts and choose the outgoing mail server and choose edit, I see the outgoing mail server in the first column, but nothing shows up in the second column or third column. In other words, the server does not have any account in the "in use by account" column.

I am also not able to send iChat text messages.

I can recieve iChat and I can receive email.

Thanks for your help.