Postfix : restricting specific domain for specific user

I am new to postfix . How can I blacklist specific domain for specific user using restriction class or by some other method.

Suppose my machine has two users - user1 and user2.

I want to blacklist or block the mails from abc.com to user1@mydomain whereas [email protected] can receive.

Similarly xyz.com should be blocked for [email protected] whereas [email protected] can receive.

Thanks in advance.

Solution

You can use restrictions class.

In main.cf, define your class like this:

smtpd_restriction_classes = ... ban_abc_com

ban_abc_com = check_sender_access hash:/etc/postfix/ban_adc_com, permit

The ban_adc_com file will contain:

adc.com REJECT

Then create a file table named protected_destinations containing:

user1@mydomain ban_abc_com

Then link all together in main.cf:

smtpd_recipient_restrictions = ..., check_recipient_access hash:/etc/postfix/protected_destinations

For user2, create a new class similar to ban_adc_com, then add in protected_destinations a new line containing:

user2@mydomain ban_xyz_com