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