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- # [Require valid host for HELO]
- #
- # Description: "Require SMTP sender to specify a valid host for HELO command"
- # Keywords: "HELO, SMTP, rejection methods, standards"
- # Category: "Enforce Internet standards"
- # Format: "{TRUE OR FALSE}"
- #
- # Some bulk mail program send a TCP/IP address, or some random text, rather
- # than a hostname as the value for the HELO command. The HELO command is
- # supposed to be given by a connecting SMTP host, to identify who they are.
- # Because the HELO text can be used to trace the source of junk mail, these
- # bulk mail programs attempt to conceal their identity by sending a useless
- # value instead. Every mail server on the Internet should have reverse DNS
- # lookups defined, and thus should provide a valid hostname as a HELO value.
- #
- # We recommend that this setting be enabled.
- #
- # By default, this setting is disabled.
- #
- # Instructions: "Please enter the word TRUE or the word FALSE below."
- FALSE
-