And the "really big boys" have many MX records with different weights that give out different values depending on the source IP address.
I remember when Yahoo's MX-record list exceeded 512 bytes and broke SO much software... However, somewhat in agreement with Jason - it used to be that you might depend on your secondary MX and that everyone would honor MX records. That is no longer true. Regards, Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP My blog: http://TheEssentialExchange.com/blogs/michael I'll be at TEC'2009! http://www.tec2009.com/vegas/index.php -----Original Message----- From: Don Andrews [mailto:don.andr...@safeway.com] Sent: Friday, January 23, 2009 1:07 PM To: MS-Exchange Admin Issues Subject: RE: stopping a spammer Not the case here - we have 2 internet feeds at separate datacenters/carriers - each has a pair of equally weighted (via MX) relays - and the preferred route has the preference set in the MX to enable that. -----Original Message----- From: Jason Gurtz [mailto:jasongu...@npumail.com] Sent: Friday, January 23, 2009 5:57 AM To: MS-Exchange Admin Issues Subject: RE: stopping a spammer > Then I lose my failover to the mail server (direct connect) > in case the 'cuda goes offline. The days of the "backup MX" are long gone. And it's really no loss-think about it: if your MX is unavailable, senders will queue mail (typically for several days) until it comes back online and then resend. Email is not a real time communication medium; that's what IM is for. If you really want a backup, get a second 'cuda and put a load balancer in front. ~JasonG -- ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~ ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~ ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
