I've searched the forums but not seen anything specific of this nature..

Say we have a fictional TLD .herro . I'm trying to block anything coming into the server from that domain..

deny message = Rejected because $sender_host_address is in an internal blacklist
senders = lsearch;/etc/exim/blacklist.cfg

So in /etc/exim/blacklist.cfg I should have *.herro . That still let mail through .. I tried using sender_domains instead of senders, as well as lsearch*; hoping that would wildcard search. Is there something I am missing or maybe this is just in the wrong part of exim.conf?