I have 3 MX records. The highest MX always returns a defer for those who are trying to go in the back door. I'm now using DynaStop to return a defer on the lowest MX record for dynamic IPs. So the middle MX will accept these.
What this does is it gets rid of spammers who don't retry. And the decrease has been huge. It has eliminated a lot of spam and has cut the load levels down on my servers significantly. Not getting any complaints. So I have to endorse it using it the way I'm using it. -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
