>>> check hosts = +relay_hosts
>>> sender host name required, to match against *.friendly.test.ex
>>> looking up host name for V4NET.0.0.97
LOG: no host name found for IP address V4NET.0.0.97
>>> host in "*.friendly.test.ex"? no (failed to find host name for V4NET.0.0.97)
>>> host in "+relay_hosts"? no (end of list)
>>> check hosts = +relay_hosts
>>> sender host name required, to match against *.friendly.test.ex
>>> looking up host name for V4NET.0.0.97
LOG: no host name found for IP address V4NET.0.0.97
>>> host in "*.friendly.test.ex"? no (failed to find host name for V4NET.0.0.97)
>>> host in "+relay_hosts"? no (end of list)