The problem is still there and I also have empty statistics for outgoing mails and the filtering of outgoing transfer is not working. The outgoing filtering works like incoming.
The guys from Proxmox adviced me to read the manual and set the ports right, but it did not solve it. They use ports for detecting the direction. Im ny opinion the source for the described functions should be configurable to use foreign domains instead of using ports.
Best regards
Volker