[nflug] Email relay question

[Robert Meyer]

No, it has to be something that happens on the server that's relaying.  I want the source address to be different for each mail source domain.  That means that if the relay is sending for domain1.com, it goes sourced from address one and for domain2.com it goes sourced from address two.

Cheers!

Bob

----- Original Message ----
From: eric <eric at bootz.us>
To: nflug at nflug.org
Sent: Wednesday, August 15, 2007 10:12:45 AM
Subject: Re: [nflug] Email relay question

Couldn't a DNS do that for you?

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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