Any assistance with this will be greatly received. An organisation which I work for hosts customer A’s mail and Customer B’s mail, another organisation has acquired customer A and B from us but don’t want to take control of their IT services however the organisation does want one (SMTP) address space to be used for both customers including themselves. This is made even more complicated by the fact that the organisation which has acquired customers A and B already has some interesting mail relay settings configured. I’ll try to explain below.
MX record – abc.net delivers to an Iron Port C360 on which there’s a rule for abc.net to deliver to an IP address in our case a Network load Balanced cluster MSE 2003 which is member of a routing group which has a SMTP connector for abc.net for the other ½ of the organisation (with its own MSE organisation on 2007) this is a crude method but it does work. Adding a third exchange organisation to this will mean another hop in the mail routing and therefore no good. We have a tight deadline but a MSE 2010 deployment is coming in the summer time but unfortunately this cannot wait that long.
So can IronPort be configured to send one address space to three exchange organisations? Via its LDAP queries? If so how?!?