Using SORBS DNSBL with Sendmail.
In your sendmail configuration you need to use the 'dnsbl' feature as explained:

FEATURE(`dnsbl',`',`"554 Rejected " $&{client_addr} " found in"')dnl

This will cause any server attempting to send mail to your server, which it's address is found in the DNSbl, to receive the message:

554 Rejected <IP-ADDRESS> found in

Where <IP-ADDRESS> is the address of the server attempting to send you mail.

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