text_combined: rick moen hfvolinuxmafiacom quoting andrew mccarthy goblvrdukdfuceltdiasie fri nov 09 2007 091220am 0800 rick moen wrote guess problem mail appliances mail servers arent compliant standards dont fall back secondary end never sending mail mostobvious example friend qmail eh hmm looks like misremembered exact scenario havent worked qmail professionally eight years precisely qmail gets 4xx tempfail primary mx subsequently never attempt fallback highernumber mxes retries primary even thereby defeating purpose secondaries poorly complying rfc 2821 section 5 thu 07 aug 2008 124324 0800 ilug advice antispam strategyblocking software