>>> check domains = +relay_domains
>>> mxt1.test.ex in "+relay_domains"?
>>> list element: +relay_domains
>>> start sublist relay_domains
>>> mxt1.test.ex in "@mx_any"?
>>> ╎list element: @mx_any
>>> check domains = +relay_domains
>>> mxt1.test.ex in "+relay_domains"?
>>> list element: +relay_domains
>>> start sublist relay_domains
>>> mxt1.test.ex in "@mx_any"?
>>> ╎list element: @mx_any