In postfix can we restrict inbound mails from gmail.com, and other free domains if they have more than one recipient?
Following conditions to consider:
Email is from Free Email domain like gmail.com, hotmail.com, etc, have one recipient address then it is ok and mail will be delivered to recipient address.
Email have more than one recipient address then mail will be forwarded to alternate email address so the administrator can review the mail before delivery to end users.
Deny emails to Group accounts from free domains like gmail.com