This interface allows you to manage a list of domains that may not send mail to your server. The system will reject any messages that it receives whose “From” address matches one of this list’s domains.

You can reject all subdomains of a given domain by prefixing the name with an asterisk (*). For example, “*.example.com” will cause this server to reject all messages sent from any subdomain of “example.com”.

This interface accepts IDNs.