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# blacklist_helo - after permit_sasl, used to stop common spammers/misconfigurations
#
# This file can be used to block hostnames used in smtp HELO command which are known bad.
# Occasionally you will run into legitimate mail servers which are misconfigured and end
# up blocked here, so this is not enabled by default, but it is useful if you are prepared
# to address those cases.
# See docs/extras/blacklist_helo.master from ispconfig source for a more complete example list.
#
# If you make changes here, also copy them to /usr/local/ispconfig/server/conf-custom/install/blacklist_helo.master,
# so your changes are not overwritten with ispconfig updates.
#/.*\.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.
#/.*\.dhcp$/ REJECT HELO hostname is using a top level domain that does not exist. See RFC 2821 section 3.6.
#/.*\.dns$/ 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.