>>> host in helo_try_verify_hosts? no (option unset)
>>> host in helo_accept_junk_hosts? no (option unset)
>>> a.b.c.d in helo_lookup_domains? no (end of list)
+>>> host in dsn_advertise_hosts? no (option unset)
>>> host in pipelining_advertise_hosts? yes (matched "*")
>>> using ACL "check_rcpt"
>>> processing "defer"
>>> ----------- end verify ------------
>>> message: >$acl_verify_message< ++++
>>> defer: condition test succeeded in ACL "check_rcpt"
+>>> end of ACL "check_rcpt": DEFER
LOG: H=(a.b.c.d) [1.2.3.4] F=<> temporarily rejected RCPT <x@mxt2.test.ex>: all relevant MX records point to non-existent hosts