Add PERMIT_DOCKER=connected-networks

Makefile

@@ -1,4 +1,5 @@
 NAME = tvial/docker-mailserver:testing
+NON_DEFAULT_DOCKER_MAIL_NETWORK_NAME=non-default-docker-mail-network
 
 all: build-no-cache backup generate-accounts run generate-accounts-after-run fixtures tests clean
 all-fast: build backup generate-accounts run generate-accounts-after-run fixtures tests clean
@@ -26,6 +27,19 @@ generate-accounts:
 	docker run --rm -e MAIL_USER=user2@otherdomain.tld -e MAIL_PASS=mypassword -t $(NAME) /bin/sh -c 'echo "$$MAIL_USER|$$(doveadm pw -s SHA512-CRYPT -u $$MAIL_USER -p $$MAIL_PASS)"' >> test/config/postfix-accounts.cf
 
 run:
+	docker network create --driver bridge --subnet 192.168.133.0/24 $(NON_DEFAULT_DOCKER_MAIL_NETWORK_NAME)
+	# use two networks (default ("bridge") and our custom network) to recreate problematic test case where PERMIT_DOCKER=host would not help
+	docker run -d --name mail_smtponly_second_network \
+		-v "`pwd`/test/config":/tmp/docker-mailserver \
+		-v "`pwd`/test":/tmp/docker-mailserver-test \
+		-e SMTP_ONLY=1 \
+		-e PERMIT_DOCKER=connected-networks \
+		-e DMS_DEBUG=0 \
+		-e OVERRIDE_HOSTNAME=mail.my-domain.com \
+		--network bridge  \
+		--network $(NON_DEFAULT_DOCKER_MAIL_NETWORK_NAME) \
+		-t $(NAME)
+	sleep 15
 	# Run containers
 	docker run -d --name mail \
 		-v "`pwd`/test/config":/tmp/docker-mailserver \
@@ -319,8 +333,10 @@ clean:
 		mail_domainname \
 		mail_srs_domainname \
 		mail_with_relays \
-		mail_with_default_relay
+		mail_with_default_relay \
+		mail_smtponly_second_network
 
+	docker network rm ${NON_DEFAULT_DOCKER_MAIL_NETWORK_NAME}
 	@if [ -d config.bak ]; then\
 		rm -rf config ;\
 		mv config.bak config ;\