SMTP>> 250 OK
SMTP<< rcpt to:<a@b>
using ACL "rcpt"
-processing "accept"
+processing "accept" (TESTSUITE/test-config 23)
check hosts = +ignore_unknown : *.$sender_address_domain : $sender_address_domain : ${lookup dnsdb{>:defer_never,mxh=$sender_address_domain}}
search_open: dnsdb "NULL"
search_find: file="NULL"