NAME¶
filter-dnsbl —
smtpd filter for DNSBL checks
SYNOPSIS¶
DESCRIPTION¶
filter-dnsbl is a filter for
smtpd(8) which can be used to check new
connections against a DNS-based Blackhole List (DNSBL).
The options are as follows:
-h
host- Set the DNSBL host to be queried.
The default host is dnsbl.sorbs.net.
The remote IP address of new connections is used in a DNS query against the
DNSBL. If the remote address is listed, the connection is rejected, otherwise
accepted.
SEE ALSO¶
filter_api(3),
smtpd.conf(5),
smtpd(8)
HISTORY¶
The first version of
filter-dnsbl was written
in 2013.
AUTHORS¶
Eric Faurot
<
eric@openbsd.org>
