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Require remote (domain) HELO

Discussion in 'E-mail Discussion' started by ramorse, May 18, 2015.

  1. ramorse

    ramorse Well-Known Member

    Sep 6, 2003
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    I have been reading and working through this page to try and prevent so much spam reaching users:

    One recommendation is to set Require remote (domain) HELO to On. But Cpanel has it set off by default. Why is this? Is there a downside to turning this on?
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Apr 11, 2011
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    Per the option description, it requires incoming SMTP connections to send a HELO that does not match this server’s local domains. Enabling this option can help prevent spoofed emails from reaching your server, however it's possible that legitimate mail may not meet the requirement. You could enable it, and review /var/log/exim_mainlog to see how often messages are blocked to determine if it's worth keeping enabled.

    Thank you.
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