- automated processing. The nested structure of multipart
- MIME messages is reflected in nested JSON output. JSON out-
- put always includes all messages in a matching thread; in
- effect <b>--format=json</b> implies <b>--entire-thread</b>
+ automated processing. The nested structure of multipart
+ MIME messages is reflected in nested JSON output. By
+ default JSON output includes all messages in a matching
+ thread; that is, by default,
+
+ <b>--format=json</b> sets <b>--entire-thread</b> The caller can disable
+ this behaviour by setting <b>--entire-thread=false</b>
+
+ <b>sexp</b>
+
+ The output is formatted as an S-Expression (sexp). This
+ format is more robust than the text format for automated
+ processing. The nested structure of multipart MIME messages
+ is reflected in nested S-Expression output. By default, S-
+ Expression output includes all messages in a matching
+ thread; that is, by default,
+
+ <b>--format=sexp</b> sets <b>--entire-thread</b> The caller can disable
+ this behaviour by setting <b>--entire-thread=false</b>