On Sun, 2011-07-17 at 21:07 -0500, Les Mikesell wrote: > On 7/17/11 4:48 PM, Always Learning wrote: > > > > Legitimate senders should not use fake, false, misleading credentials. > There is no requirement for the greeting name to match any IP, and isn't likely > to work for multi-homed and/or clustered machines. Which type of 'multi-homing' were you thinking about ? http://en.wikipedia.org/wiki/Multihoming * Single Link, Multiple IP address (Spaces) * Multiple Interfaces, Single IP address per interface * Multiple Links, Single IP address (Space) * Multiple Links, Multiple IP address (Spaces) Which type of 'cluster' were you thinking about ? http://en.wikipedia.org/wiki/Computer_cluster * High-availability (HA) clusters * Load-balancing clusters * Compute clusters If any of these share the same IP address, they can share the same host name. I am not well acquainted with either of the above two methods, multi-homed and clusters, but I can not understand why any of them should resort to using fake identities when sending-out emails. Can you help me understand why bogus identities are necessary in these circumstances ? Thank you. -- With best regards, Paul. England, EU.