A secondary MX host will get mostly spam. Mailers that follow the rules will use the MX records as they were intended. Spammers scan all hosts for port 25 and send email through them any way they can. You can put a machine on the Internet without any MX records and spam will start flowing through it. It usually does not take them very long to discover a mail server.
The upside is that the spam can be used for testing new versions of SpamAssassin. :) On Fri, 18 Mar 2005 08:09:24 -0500, Yang Xiao <[EMAIL PROTECTED]> wrote: > 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 >
