I just had the reverse problem. Working for a large company using Exchange for outbound business email we were always hitting one company's secondary MX which was broken (sent back rejections).
Our servers just liked the second MX better than the primary MX for some reason. When I manually telneted into both the primary and the secondary MX I noticed the secondary responded much faster than the primary to commands. So maybe the primary just could not respond quick enough to our email server so it flipped to the secondary which was much faster. (just guessing here) > Hi all, > I've been noticing it lately that almost 90% of emails come in through > our secondary MX host are spams, I just want to know if there's an > explanation for this, my guess is that the spammers spam the secondary > MX host intentionally for some reason I can't understand, maybe hoping > the secondary host will configured with less care? > > Many thanks, > > Yang >
