how about setup a whitelist domains list?
for instance, only allow .com, .net, .org, .de, .ca and some coutries
TLD to be passed through.
Phil Stracchino via Postfix-users:
There are a few ccTLDs that I block completely (looks like four), all of
them problematic ccTLDs from which I have only ever seen clearly
malicious mail. I *do* however block a list of about thirty or so junk
"new" TLDs that were consistent spam sources, but with occasional
whitelisting of legitimate domains within even those. (For instance I
currently block .shop *except for* wandering.shop, which is widely used
by other writers.)
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