Conversion control

The actual conversions performed by the conversion channel are controlled by rules specified in the MTA conversions file (legacy configuration) or   MTA option (Unified Configuration). As of MS 7.0, the conversions file is (symbolically)  , i.e.,  CONFIGROOT. (In prior versions, the conversions file was located via the IMTA tailor file option  , normally pointing to   .)

Note: Even in Unified Configuration, it is most convenient to think of the  option as a file, accessed and modified via the command msconfig&#x3e; EDIT CONVERSIONS so from here on, references will be simply to "the conversions file", even for a Unified Configuration.

The MTA conversions file is a text file containing entries in a format that is modelled after MIME Content-type: parameters (see RFC 2045). Each entry consists of one or more lines grouped together; each line contains one  or more  "    "  parameter clauses. Quoting rules conform to MIME conventions for Content-type: header line parameters. Every line except the last must end with a semicolon. Entries are terminated by either a line that does not end in a semicolon, one or more blank lines, or both. For example, the following entry specifies that application/x-ddif parts in messages  sent out to the Internet should be converted to PostScript: out-chan=l; in-type=application; in-subtype=x-ddif; out-type=application; out-subtype=postscript; parameter-copy-0=&#x2a;; command="ddifps $INPUT_FILE $OUTPUT_FILE"

See also:
 * Conversion entry scanning and application
 * Conversion entry parameters
 * Conversion entry parameter value wildcard matching
 * Conversion predefined symbols and environment variables
 * Conversion entry mapping table callouts
 * Conversion script header access
 * Conversion script exit statuses
 * conversions MTA Option
 * Conversion channel