[exim] Syntax Inconsistencies

It would be nice if the Exim syntax were consistent between the ACLs and
the transport/routers

For example - ACLs allow multiple condition lines, routers don't. ACLs
allow !condition - routers don't. Exim would be far easier to work with
if the router and ACL commands were more consistent.

Not trying to complain - just making a suggestion for improvement.