# Syntax:
# user@~NOH		new_user@new_host.new_domain (empty host part)
# user@~THH		new_user@new_host.new_domain (this host by any name)
# user@host.domain	new_user@new_host.new_domain (specific host part)
# user			new_user@new_host.new_domain (any local user)
# (Use a RHS of "." to indicate "no change" if you want to partially eclipse
# the "any local user" form with a more specific address--it's more efficient
# than aliasing a user to herself.)
#
# A local user is any user with a host reachable by a local ($=L) mailer.
# %1 = user; %2 = host; %3 = $J