FILTER-DNSBL(8)

NAME
filter-dnsbl - block senders based on dnsbl

SYNOPSIS
filter-dnsbl [-mv] blacklist ...

DESCRIPTION
filter-dnsbl looks up the IP address of the sender at the blacklist (a domain name) and by default drops the connection if it is found. If the -m flag is specified it will allow the message to continue, but it will be marked with an X-Spam and X-Spam-DNSBL header. For more verbose logging the -v flag can be used.

Lists matching the IP address are echoed back to the sender. Paid services from Abusix and Spamhaus have their key stripped.

SEE ALSO
smtpd(8)