I have a complicated settings, and I hope I can have some advice. I setup the access rule to block the outsider sending mails to the internal mail group.
This is what I did. /etc/postfix/main.cf ..... check_client_access hash:/etc/postfix/access ..... ..... /etc/postfix/access a...@cde.com mynetworks,reject I need to allow h...@cde.com to send mail to a...@cde.com from outsider of mynetworks. h...@cde.com is one of the recipient in the a...@cde.com mail group. Thanks, Andrew