Creating a restriction on sending to a particular user or group

Requirement:

email / group email: test_group001@mydomain.com
Allowed on to send on this mail is only good.user@yahoo.com


Setup:

1. Existing working smtp postfix server.

Needed configs:


1. mkdir /etc/postfix/global_restriction
2. create a file /etc/postfix/global_restriction/global_group_allowed
#/etc/postfix/global_restriction/global_group_allowed
#entry for that file:
good.user@yahoo.com OK

3. create a file /etc/postfix/global_restriction/global_group_restriction
#/etc/postfix/global_restriction/global_group_restriction
#entry for the file below:
test_group001@ class_allowed_to_send_to_global_group

4. Create a restriction class at /etc/postfix/main.cf

Below should exist on that file:

smtpd_recipient_restrictions =
check_recipient_access hash:/etc/postfix/global_restriction/global_group_restriction
permit_mynetworks
#premit my network should be under check_recipinet_access so it will not allow thus sender with network

smtpd_client_restrictions =
check_recipient_access hash:/etc/postfix/global_restriction/global_group_restriction
permit_mynetworks


smtpd_restriction_classes = class_allowed_to_send_to_global_group
class_allowed_to_send_to_global_group = check_sender_access hash:/etc/postfix/global_restriction/global_group_allowed, reject


5. After creating, postmap all related file and postfix reload