On a new GW7.01 system, when I send a message to myself from an external
account, with a GW user in the BCC field, the mail gets automatically
forwarded to Postmaster.

I've copied the PFA from our own production server, which runs GW6.5, and I
_can_ send messages using the BCC field to users on that system.

At first I thought there might be a difference between the GWIA of GW6.5
and GW7.01 in handling BCC's, but when I install iMailDS as blind forwarder
on the testing server, BCC's are handled as they should. Problem solved,
thou might think.
Problem though, is that iMailDS is not an option, since it costs another
300 dollars, and we KNOW it is working on GW6.5

Any ideas?