IP Blocker Service

The IP Blocker service rejects messages originating from IP addresses blacklisted by Sophos Labs ™. Enabling this option can improve performance by blocking spam before it reaches more complex tests in the Policy.


If you want to enable MTA-level IP blocking, but you require that a select group of internal email addresses be exempt from blocking, you can create a recipient exception list.

Be aware, however, that doing so will result in a higher rate of spam because any message addressed to multiple recipients that contains at least one address from the recipients exception list will be delivered to all recipients of that particular message, even if the recipients are not on the exception list. For details about configuring a recipient exception list or an explanation of your options with regard to this feature, contact Sophos support.

  • /opt/pmx6/etc/init.d/pmx-blocker : The IP Blocker service control program.
  • /opt/pmx6/bin/pmx-blocklist : Performs conversions on blocklist data.
  • /opt/pmx6/etc/pmx.d/blocklist.conf : Used to set configuration options for the MTA-level IP Blocker.