[exim] route outgoing mail through a relay

I am running exim4 on a server with dynamic IP address, and so I am being
considered as a spammer by other mail servers. The whole problem is
documented for example in the following articles.
http://bcn.boulder.co.us/~neal/cablemail.html
http://lists.freebsd.org/pipermail/freebsd-questions/2003-August/015306.html

In my situation I should probably let exim route any outgoing mail through
my ISP's relay instead of sending it directly. I will also have to give exim
my uid and password at the ISP's mailer.
Is this possible?

Luc

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