Mail won't send; problem is not user-specific

My friend has a white MacBook and can't send mail. In System Prefs we created a new user, and then in that user's Mail we added the same account. Still couldn't send. The same Mail account settings work fine when added on my MacBook Pro and also on her PC.
She is able to receive mail, just not send it. She's convinced that her MacBook is a lemon.

Problem solved -- and I was wrong above when I said that only her machine was affected. Truly identical settings on different machines had identical results.
We were setting authentication to "Password", but her ISP requires NO password. This just threw me off, because I'd never seen an outgoing mail server choke on the presence of a password. Absence, yes, but not presence.
So, no, it was not the port settings, but thanks for the reply.

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