-DST := /etc/postfix
+SUBDIRS := postfix postfixadmin dovecot
 
-INPUTS := \
-       configuration/main.cf \
-       configuration/master.cf \
-       configuration/postgrey_whitelist_clients.local \
-       configuration/postgrey_whitelist_recipients \
-       configuration/rbl_override \
-       configuration/mysql/relay_domains.cf \
-       configuration/mysql/virtual_alias_maps.cf \
-       configuration/mysql/virtual_domains_maps.cf \
-       configuration/mysql/virtual_mailbox_limits.cf \
-       configuration/mysql/virtual_mailbox_maps.cf
+all: $(SUBDIRS)
+.PHONY: $(SUBDIRS)
 
-OUTPUTS := $(subst configuration/,$(DST)/,$(INPUTS))
-
-all: $(OUTPUTS) postfixadmin
-
-postfixadmin:
-       ./setup-postfix.sh
-
-$(DST)/%: configuration/%
-       @mkdir -p $(@D)
-       cp $^ $@
+$(SUBDIRS):
+       $(MAKE) -C $@