[EXIM] exim and pipes

hi there

     I've got some problems with exim and pipes....
     ...i know that exim wants an uid and gid to execute pipes so.....

     i got an entry in /etc/aliases like this

     --snip--

     ftp:root
     webmaster:root
     user:
       driver = pipe
       user = $nobody
       group = $nogroup
       command = "|/usr/sbin/list user"

     --snap--

     if I send an email to user "user" exim writes the following log-entry:
     1999-06-23 13:19:45 10wl4D-0000uC-00 == user@??? D=system_aliases 
     defer (-18): <user@???> - error in alias file /etc/aliases: 
     missing or malformed local part (expected word or "<") in "driver = 
     pipe user = $nobody group = $nogroup command = "|/usr/sbin/list user""

     I know that this domain doesn't exist but my DNS know how to handle it 
     :))

     any ideas....

     thanx

     Stefan

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