I have setup a catchall router on exim (used as last router):
catchall:
  driver = redirect
  domains = +local_domains
  data = ${lookup{*@$domain}lsearch{/etc/aliases}}
  retry_use_local_part
This works perfectly when sending emails locally. However, if 
I login to my GMail account and send an email to 
[email protected], then 
I get an "Unrouteable Address".
Thank you for any hints to solve this issue.