> On 20 Sep 2016, at 21:10, li...@lazygranch.com wrote:
> What is the simplest way to block a TLD?

Put the offending TLD in a map and have that map referenced through 
check_sender_access and/or check_client_access.


in main.cf:

smtpd_client_restrictions = permit_mynetworks
        check_client_access hash:/etc/postfix/spamsources

mtpd_sender_restrictions = permit_mynetworks
        check_sender_access hash:/etc/postfix/spamsources

and in /etc/postfix/spamsources:

xyz     500 This TLD sends spam - get lost.

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