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# blacklist_helo - after permit_sasl, used to stop common spammers/misconfigurations
#
# probably just put REJECT lines in here,
# as OK lines will bypass a lot of other checks you may want done
# (use DUNNO instead of OK)
#
# common for spammers (check https://data.iana.org/TLD/tlds-alpha-by-domain.txt and remove valid tld's occasionally)
/.*\.administrator$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.admin$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.adsl$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.arpa$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.bac$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.coma$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.dhcp$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.dlink$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.dns$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.domain$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.dynamic$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.dyndns\.org$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.dyn$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.firewall$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.gateway$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.home$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.internal$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.intern$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.janak$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.kornet$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.lab$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.lan$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.localdomain$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.localhost$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
# .local is used by spammers a lot, but too many otherwise legit servers hit it
# (instead of REJECT, should send to greylisting)
#/.*\.local$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.loc$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.lokal$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.mail$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.nat$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.netzwerk$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.pc$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.privat$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.private$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.router$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.setup$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.119$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.beeline$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.cici$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.gt_3g$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.gt-3g$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.hananet$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.skbroadband$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
/.*\.tbroad$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.