[exim] converting postfix to exim

I would like to convert my postfix installation to an exim installation
but I need to know if I can convert this ldap search to exim and how it
would look. I let the postfix search the directory and then it extracts
the mailHost attribute and builds a command that sends the email
directly to the required mailhost. How would the configuration below
look in exim.


ldapalias_server_host = ldap.domian.com
ldapalias_server_port = 389
ldapalias_bind = no
ldapalias_search_base =
ldapalias_query_filter = (|(mail=%s)(mailAlternateAddress=%s))
ldapalias_result_filter = smtp:%s
ldapalias_result_attribute = mailHost
ldapalias_domain = domain.com


CArinus