Postini uses it for their clients. They set up 4 'real' mx records (priority 100,200,300,400) that point to real postini servers. They set up priority 500 that points to the (firewalled) smtp server of the client. (as in firewalled to the world, except to postini)
Works great. Spammers hitting mx 5 (or anyone else) deserve to have their email dropped. Legit clients have 4 tries to get a valid server. Didn't qmail have a problem if it hit a 'dead' primary mx server first? -- Michael Scheidell, CTO >|SECNAP Network Security Winner 2008 Network Products Guide Hot Companies FreeBsd SpamAssassin Ports maintainer Charter member, ICSA labs anti-spam consortium _________________________________________________________________________ This email has been scanned and certified safe by SpammerTrap(tm). For Information please see http://www.spammertrap.com _________________________________________________________________________
