-SRC := $(shell pwd)
 DST := /etc/postfix
 
-INPUTS := configuration/* configuration/mysql/*
+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: $(INPUTS:configuration/%=$(DST)/%) postfixadmin
+OUTPUTS := $(subst configuration/,$(DST)/,$(INPUTS))
+
+all: $(OUTPUTS) postfixadmin
 
 postfixadmin:
        ./setup-postfix.sh
 
-$(DST)/%: $(SRC)/%
+$(DST)/%: configuration/%
        @mkdir -p $(@D)
        cp $^ $@