selective service disable (#250)

* Allow disabling amavis service

Setting the `DISABLE_AMAVIS=1` env var will skip the starting of the
amavis process.

* Enable option to not run spamassassin

Setting the `DISABLE_SPAMASSASSIN=1` env var will start this container
without spamassain.

* Allow starting of the container without clamav

Setting the `DISABLE_CLAMAV=1` env var will start this container without
starting clamav.

Makefile

@@ -48,6 +48,24 @@ run:
 		-e ENABLE_FAIL2BAN=1 \
 		--cap-add=NET_ADMIN \
 		-h mail.my-domain.com -t $(NAME)
+	sleep 20
+	docker run -d --name mail_disabled_amavis \
+		-v "`pwd`/test/config":/tmp/docker-mailserver \
+		-v "`pwd`/test":/tmp/docker-mailserver-test \
+		-e DISABLE_AMAVIS=1 \
+		-h mail.my-domain.com -t $(NAME)
+	sleep 20
+	docker run -d --name mail_disabled_spamassassin \
+		-v "`pwd`/test/config":/tmp/docker-mailserver \
+		-v "`pwd`/test":/tmp/docker-mailserver-test \
+		-e DISABLE_SPAMASSASSIN=1 \
+		-h mail.my-domain.com -t $(NAME)
+	sleep 20
+	docker run -d --name mail_disabled_clamav \
+		-v "`pwd`/test/config":/tmp/docker-mailserver \
+		-v "`pwd`/test":/tmp/docker-mailserver-test \
+		-e DISABLE_CLAMAV=1 \
+		-h mail.my-domain.com -t $(NAME)
 	# Wait for containers to fully start
 	sleep 20
 
@@ -77,4 +95,4 @@ tests:
 
 clean:
 	# Remove running test containers
-	docker rm -f mail mail_pop3 mail_smtponly mail_fail2ban fail-auth-mailer
+	docker rm -f mail mail_pop3 mail_smtponly mail_fail2ban fail-auth-mailer mail_disabled_amavis mail_disabled_spamassassin mail_disabled_clamav