> Gmail, like Yahoo and Hotmail and AOL, is sporadically useful for casual > purposes where mail transmission and receipt isn't terribly important. > But it's much too poorly operated to be acceptable for professional use. Plus the fact that "@yahoo.com" and "@gmail.com" (etc.) serve as good first-level 'Bozo Filters'. DMARC serves as yet another reminder that serious professionals should not be using such email addresses. Ross.