ci: move tests than can be run in parallel now (#3038)

test/tests/parallel/set3/mta/smtponly.bats

@@ -0,0 +1,44 @@
+load "${REPOSITORY_ROOT}/test/helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+
+BATS_TEST_NAME_PREFIX='[SMTP-Only] '
+CONTAINER_NAME='dms-test_env-smtp-only'
+
+function setup_file() {
+  _init_with_defaults
+
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env SMTP_ONLY=1
+    --env PERMIT_DOCKER=network
+  )
+
+  _common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
+
+  _wait_for_smtp_port_in_container
+}
+
+function teardown_file() { _default_teardown ; }
+
+@test "Dovecot quota absent in postconf" {
+  _run_in_container postconf
+  assert_success
+  refute_output --partial "check_policy_service inet:localhost:65265'"
+}
+
+# TODO: needs complete rework when proper DNS container is running for tests
+@test "sending mail should work" {
+  skip 'TODO: This test is absolutely broken and needs reworking!'
+
+  assert_success
+
+
+  # it looks as if someone tries to send mail to another domain outside of DMS
+  _run_in_container_bash "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/smtp-only.txt"
+  assert_success
+  _wait_for_empty_mail_queue_in_container
+
+  # this seemingly succeeds, but looking at the logs, it doesn't
+  _run_in_container_bash 'grep -cE "to=<user2\@external.tld>.*status\=sent" /var/log/mail/mail.log'
+  # this is absolutely useless! `grep -c` count 0 but also returns 0; the mail was never properly sent!
+  [[ ${status} -ge 0 ]]
+}