Sendmail redirect problem

[Alex Zivenko]

Hi people.
I have some problem here. I need a mail account on the another server, which runs on freebsd. I have a mail account, for example twistfire at rambler.ru. I need a mail account like
fire at someserver.ru. But the  acces is restricted to prevent security vulnerabilities. The mail server is closed for ip addresses not from their subnets. So I decided not to login there, but when the mail will come to fire at someserver.ru t will automatically redirects to twistfire at rambler.ru.
How can I do that? What I need to do in Sendmail?
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Best regards,
Alex Zivenko
ICQ# 298887381
e-mail: twistfire at rambler.ru
http://www.netgen.com.ua