On Friday, March 18, 2005, 2:13:23 PM, jdow jdow wrote: > From: "Yang Xiao" <[EMAIL PROTECTED]>
>> 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? > Wow, it's been awhile since this floated through the list the last time. > The theory among the spammers is that the secondary and tertirary > MX machines are less well protected. "They're backups, afterall. > They're not used every day." > Most canny anti-spammers are aware of this and may actually have the > secondaries nailed down a little tighter than the primaries. We're applying more RBLs to our backup server than our primary MXer. What was the trick for making a mail server delay or reject responses the first time an IP connects? I've heard this is very effective against spamware/zombies, etc. We're using Postfix, so this is definitely off topic. Jeff C. -- Jeff Chan mailto:[EMAIL PROTECTED] http://www.surbl.org/
