[Mimedefang] Stream_by_domain

[WBrown at e1b.org]

DFS wrote on 01/17/2006 03:35:08 PM:

> It's hairy, but manageable.  Doing per-recipient content-filtering is
> a lot hairier and less managable; we have to use hacks like
> stream_by_domain or stream_by_recipient.  Unfortunately, that's just how
> SMTP works.

Speaking of stram_by_domain, Is there any way to get mail from the same 
source, but to different domains to be sent on different connections?

I was wondering if setting different names on the MX records like the 
following would make a difference:

domain1.com IN MX 10 filter.domain1.com
filter.domain1.com IN A 1.2.3.4

someotherdomain.com IN MX 10 filter.someotherdomain.com
filter.someotherdomain.com IN A 1.2.3.4

Do MTAs look at the name, or the IP when deciding to send messages on one 
connection?

What would be the downside to binding 50 or more IP addresses, one for 
each domain handled to the NIC on an RHEL 3 box and giving each domain 
their own IP address on the box?