>i actually thougt about having a db on each of the servers with a shared 
>interface

nothing shared, each IMGate should be fully independent and self-contained.

>we are at the moment taking about 100 k off messages a day

serious, but not really heavy for one machine

>thes 2 shall be like
>
>mx 5 the Imail server

??? why put the indefensible Imail server BEFORE the tough-as-nails IMGate 
boxes??

>i already have 2 Imail servers in front and and an Imgate as a gateway out
>
>Just want to increase the amount of mail i can receive

IMGate as MX 5 and Imail as no MX will scale MUCH better than what you have.

>and have a failover system that are safe and ready to denfend a new Sobig
>attack

In IMGate terms, you aren't ready for anything since you have Internet 
hitting the mailbox server directly.

Len


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