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Initialization Parameters for Filter Applications
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In addition to initializing libmilter, a filter application must initialize the following parameters before calling the smfi_main() API:

  • The callbacks the filter program requires to call and the types of message modification you intend to perform. You must initializing these parameters. For more information, see “The smfi_register() API”.

  • The socket address to be used when communicating with an MTA. You must initialize these parameters. For more information, see “The smfi_setconn() API”.

  • The number of seconds the filter application must wait for MTA connections before timing out. You can optionally initialize this parameter. For more information, see “The smfi_settimeout() API”.

A subsequent call to the smfi_main() API fails if the filter application fails to initialize libmilter and if one or more parameters passed by the filter application are invalid.



Call Order Sequence
  		 


Sample Filter Pseudocode