Block incoming e-mails from a specific domain or a country

To block these serverwide or on a per-user basis, you may do so by editing the blacklist settings. To block email from a particular country, you may use the pattern of ‘*@*.’. To block a specific domain, you would use ‘*@*.’. For instance, if you wanted to block all mail from Taiwan, you would use ‘*@*.tw’. Or to block all mail from mydomain.com, you would use ‘*@*.mydomain.com’.

Common Firewall Commands: Iptables, CSF, UFW, & Firewalld

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