I have mail services: main and a sub-domain running on two separate servers, with one on sendmail and the other on postfix+cyrus. I wish to run both the domains under one host, and since they are in production, wish to retain separate MTAs, one for each domain. I have a single NIC on this host and wish to share port 25 between the two. Kindly let me know how this can be achieved.
Thanks in advance