Leandro Noferini <lnoferin@cybervalley.org> writes:

> and from some days using the gnus inside (Gnus v5.13) trying to send
> a message I get an error message like the subject
>
> 'smtp-server' not defined
>
> What's changed? What I need to do?

Dunno, and I have not a clue about what's wrong with your config file,
but in order to fix it, tell me if your .gnus file contains a string
liky this:

(setq smtpmail-default-smtp-server "sr01.freehck.ru")