[nflug] Email relay question

[Cyber Source]

A headache started about half way through this email but what if you 
were to think in terms of pulling instead of pushing? A creative use of 
fetchmail perhaps?

Robert Meyer wrote:
> OK, before we get into this, remember that this is NOT my design.  I'm 
> trying to make the best of what I have here...  Having said that...
>
> We currently have several clients, all using an Imail server 
> (remember, not my design) to handle Email.  We are also routing a few 
> Exchange servers through it.  In essence, all mail coming in for these 
> clients hits a single server that separates the domain names and 
> routes the mail to the backend servers.  We also have some clients 
> that are actually storing their mail on the Imail server.  These two 
> functions are going to be separated so that the relay server and the 
> POP/IMAP functions are on different boxes.  The mail servers that I 
> relay for also relay back through the Imail server.  The problem is 
> that if one client gets infected with a spam virus or otherwise gets 
> the server tagged as a spam host, it breaks all of the clients that 
> route through that server.  We (actually, they) want to keep the 
> single relay host, because it's good for troubleshooting.  (remember, 
> not my design)
>
> What I need to know is:  Is there any way that I can set up a system 
> that will relay mail from internal mail servers but have the IP 
> address leaving the server be different for each domain.  Essentially, 
> I want it to look like each domain is coming from a different server.  
> We are switching the relay server to CentOS (RHEL clone) and are going 
> to use Postfix for the relay functions.
>
> The only idea that comes to mind is to create multiple virtual servers 
> with VMWare and route each client through a different virtual 
> machine.  I know I can create multiple IP aliases on the machine.  Can 
> I leverage that somehow to get different source addresses for 
> different domains?
>
> Thanks...
>
> Cheers!
>
> Bob
>
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