[Exim] smtp auth on upstream server ... is it possible ?

hello

I want my exim (home) to pass all outgoing mail through another smtp server (remote/also exim),
but my upstream server requires smtp authentication. So can i tune up my exim (home), to make
it behave as client in smtp auth process. host_accept_relay not usable 'cause at home i use
dialup with dynamic ip's.

thanks in advance
blackOut