[nflug] Email relay question

[Darin Perusich]

Will this machine be an MX server or will it be behind your MX and 
relaying from there? I'm also not understanding your SPAM tagging point. 
Are you concerned about your relay marking mail from the domains it's 
relaying for marking them as SPAM? This is easily remedied by setting 
the following spamassassin rule and included ALL of the relaying domains:

header LOCAL_RCVD Received =~ /.*\(\S+\.cognigencorp\.com\s+\[.*\]\)/
describe LOCAL_RCVD Received from local machine
score LOCAL_RCVD -50

The only way outgoing mail will be sent from a different IP is using 
some type of virtualization, and why doesn't this even matter? It sounds 
like over complicating the setup.

You mentioned using Postfix for the MTA, a wise move IMHO ;-). Are you 
planning on using amavisd-new to filter, tag spam, and virus check? This 
is a very typical and efficient setup for relaying for multiple domains 
not to mention straightforward. Your setup is a little more complication 
then what I have setup here but it's pretty much the same. If you want 
more details let me know.

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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-- 
Darin Perusich
Unix Systems Administrator
Cognigen Corporation
395 Youngs Rd.
Williamsville, NY 14221
Phone: 716-633-3463
Email: darinper at cognigencorp.com