Yes, you're true for the ip level. It's why I'm looking for a layer 7
(application level) solution. For instance, I'm using postfix not sendmail.
Have you a postfix based solution ?
Les Mikesell a écrit :
Luc MAIGNAN wrote:
My problem : I have two mails servers and I want to distribute
incoming mails to a server depending of the domain (e.g.
somebody@xxxxxxxxxxx to server1 and somebody@xxxxxxxxxxx to server2)
Uh, why? Is there some reason DNS won't do what you need? With 2
separate domains, just point your MX record to the correct server.
Or am I missing something obvious here?
> No, because the MX of the two domains points to the same IP (services
> are dispatched behind this IP)
Nothing at the IP level can distinguish inbound connections for the
different destinations and they are all going to be connecting to port
25. However, you can configure sendmail at that IP address (or
wherever you direct port 25) to accept for both domains and relay to
the other one at an address specified in mailertable. The problem
you'll have with this is that the first machine won't know the users
on the other domain and will relay everything. If you get a lot of
spam to non-existent users, then the real server will reject them and
the relay will have to construct and try to deliver a bounce, clogging
up your queues. To avoid that you might use virtusertable to list all
the valid recipients at the other domain and a default rejection if
they don't change too much, or something like MimeDefang which can
check the real host for the recipient via smpt before accepting at all.
