PMDF System Manager's Guide


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Chapter 22
Message Manipulation Channels

This chapter describes how to use the conversion, script, and disclaimer channels to modify messages as they pass through PMDF.

The conversion channel allows processing of message attachments and other body parts using external, third-party programs and site-supplied procedures, such as virus scanners. The execution of such procedures is controlled by the CONVERSIONS mapping table and the conversions file. The conversion channel is discussed in Section 22.1.

The PMDF conversions file, discussed in Section 22.1.3, is used to specify the details of conversion channel processing and to specify the details of some internal CHARSET-CONVERSION table triggered conversions (see Chapter 6).

Note

If you use both a CONVERSIONS mapping table to invoke the conversion channel and a CHARSET-CONVERSION mapping table to perform character set conversions (see Chapter 6), the CONVERSIONS mapping table takes precedence. In this case, all entries with RELABEL=1 in the conversions file are skipped. A conversions file entry can be changed from being associated with the CHARSET-CONVERSION mapping table to being associated with the CONVERSIONS mapping table by replacing the RELABEL=1 parameter with the COMMAND parameter. The command specified could be as simple as copying the input file to the output file.

The script channel allows processing of messages in their entirety using external, third-party programs and site-supplied procedures. The execution of such procedures is controlled by the SCRIPT mapping table. The script channel is discussed in Section 22.2.

The disclaimer channel allows arbitrary text (usually in the form of a disclaimer) to be added to messages. The addition of such text is controlled by the DISCLAIMER mapping table. The disclaimer channel is discussed in Section 22.3.


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