>>> check hosts = 10.9.8.7
>>> host in "10.9.8.7"?
>>> list element: 10.9.8.7
>>> host in "10.9.8.7"? yes (matched "10.9.8.7")
>>> check sender_domains = some.domain
>>> check hosts = 10.9.8.7
>>> host in "10.9.8.7"?
>>> list element: 10.9.8.7
>>> host in "10.9.8.7"? yes (matched "10.9.8.7")
>>> check sender_domains = some.domain