Ok, sorry. Posting in plain text now. I'm using Cyberguard firewall & I heard it's stateful. It's not managed by me but by the network/security guys.
So by permitting SMTP from those selected domains' SMTP gateways to my postfix server is not sufficient even if I only need to receive incoming mails from those domains & don't need to send any outgoing mails from my postfix server? Our firewall chap found from the Cyberguard logs that there's accepted SMTP traffic passing through the firewall from the SMTP gateways of those permitted domains. Does the latest maillog I posted previously help? Thanks Sun