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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).
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.
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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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