[Pkg-exim4-users] Drop email to unknown recipients?

[Randy Orrison]

Hi,

I've just installed exim4 on a new install of etch (using conf.d).
I get tons of email to invalid local addresses, all of which is spam.
What I want to do is just drop it, but exim4 is now generating bounce
messages to the forged sender addresses, which are getting rejected as
either unknown user or spam.  I can't just reject it at SMTP time, as
I'm using fetchmail.

I have previously been using exim3, with an added director that looks
like this:

   catchall:
     driver = smartuser
     new_address = :blackhole:

But I'm not sure how to use that with exim 4 - I tried adding it to
the router directory as 999_bin_the_rubbish but exim rejects it with
the error 'router catchall: cannot find router driver "smartuser"'.

I'm still looking, but any advice would be much appreciated!
...
Since writing that I've tried a variety of things involving appendfile 
and /dev/null, but still haven't found anything that works.

Randy