>>> check domains = +relay_domains
>>> relay.one.ex in "Test.ex : Relay.one.ex"? yes (matched "Relay.one.ex")
>>> relay.one.ex in "+relay_domains"? yes (matched "+relay_domains")
>>> accept: condition test succeeded in ACL "check_recipient"
>>> end of ACL "check_recipient": ACCEPT
>>> using ACL "check_recipient"
>>> check domains = +relay_domains
>>> relay.one.ex in "Test.ex : Relay.one.ex"? yes (matched "Relay.one.ex")
>>> relay.one.ex in "+relay_domains"? yes (matched "+relay_domains")
>>> accept: condition test succeeded in ACL "check_recipient"
>>> end of ACL "check_recipient": ACCEPT
>>> using ACL "check_recipient"