>> > One of the things I've considered for #2 is having a secondary MX >> > which is configured to give back a 4xx for everything. >> > > We have this kind of setup for about a year now and never experienced > any problems. As many spam-senders tend to use the backup-MX for spam > delivery, our 4xx-MTA catches a lot of spam. If you "tail -f" the > logs, you only see suspicious hosts connecting. It also decreased the > load on the primary servers. >
I understand the value in this setup as a SPAM honeypot, but the question I suppose I still need answered: Is there [technically] any availability benefit provided by a second MX of this nature versus the self-retry feature most mail servers utilize? Won't a 4xx message result in the same behavior as if I can't connect to a primary? With both messages getting deferred for retry? And if that is indeed the case, I go back to my original question: "Is a secondary MX worth the effort?" -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
