Authentication
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NNTP authentication
Some servers want authentication for reading and/or posting news. Alexandra currenty just supports the old AUTHINFO USER/PASS protocol, AUTHINFO GENERIC will be supported in a future version.

Let's say your nntp server is "foo.bar", your username is qwert and you password is asdf.
To  enable authentification, write in Terminal.app:
dwrite Alexandra "Doauth foo.bar" YES
To set the username, write:
dwrite Alexandra "Authuser foo.bar" qwert
To set the password, write:
dwrite Alexandra "Authpasswd foo.bar" asdf

Set these values before you connect to the nntp server.
Enjoy.