[Exim] aliases

I am trying to get aliases to work so when I send out email the local part
'root' will alias to davidturetsky as will the local part 'david'

This is how the relevant part of exim.conf looks:

system_aliases:
driver = aliasfile
# >> Option added by convert4r3
file_transport = address_file
# >> Option added by convert4r3
pipe_transport = address_pipe
file = /etc/aliases
search_type = lsearch

In /etc/aliases I have root: davidturetsky and david: davidturetsky

None of this has any effect. Reading the aliasfile director specs did
not shed any light. What am I missing?

David