[Exim] $local_part in aliases

According to FAQ Q0426 in the Exim 4 FAQ, it is possible to set an
"expand" option in a redirect router to make it possible to have a
string like $local_part in an alias file.

However, when I try to add this option, I get panic errors when
restarting exim. I don't see any mention of an "expand" option in the
Redirect Routers section of the documentation.

What I'm trying to do is create an alias line that says:

*:    $local_part@???

so that all mail gets forwarded to the same local address at another
domain.

Thanks!

--
Mark Edwards
San Francisco, CA