Securing iPlanet Messaging Server 5.x
Information provided by: Matthew Sullivan
Additional Information: iPlanet Messaging Server 5.x is secure from relay by default if you are using a standalone server.

Chapter 10 of the Admin Guide for iMS 5.2 details how to control relay access.

If you are using a cluster of servers, or you are using other (even non iPlanet) mailservers in the same domain which will allow relaying for your iPlanet Messaging Server 5.x server you must add the following to the ORIG_SEND_ACCESS part of the mappings file:
! Block "external" submissions of explicitly source-routed "internal" addresses
  tcp_local|*|tcp_intranet|@*:*.*   $N$D30|Explicit$ routing$ not$ allowed
  tcp_local|*|tcp_intranet|*$%*@*   $N$D30|Explicit$ routing$ not$ allowed
  tcp_local|*|tcp_intranet|*.*!*@*  $N$D30|Explicit$ routing$ not$ allowed
  tcp_local|*|tcp_intranet|"*@*"@*  $N$D30|Explicit$ routing$ not$ allowed

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