- "\t\tFormat output as Javascript Object Notation (JSON).\n"
- "\t\tJSON output always includes all messages in a matching,\n"
- "\t\tthread i.e. '--output=json' implies '--entire-thread'\n"
+ "\t\tThe output is formatted with Javascript Object Notation\n"
+ "\t\t(JSON). This format is more robust than the text format\n"
+ "\t\tfor automated processing. JSON output always includes all\n"
+ "\t\tmessages in a matching thread; in effect '--format=json'\n"
+ "\t\timplies '--entire-thread'\n"
+ "\n"
+ "\t\tmbox\n"
+ "\n"
+ "\t\tAll matching messages are output in the traditional, Unix\n"
+ "\t\tmbox format with each message being prefixed by a line\n"
+ "\t\tbeginning with 'From ' and a blank line separating each\n"
+ "\t\tmessage. Lines in the message content beginning with 'From '\n"
+ "\t\t(preceded by zero or more '>' characters) have an additional\n"
+ "\t\t'>' character added. This reversible escaping is termed\n"
+ "\t\t\"mboxrd\" format and described in detail here:\n"
+ "\n"
+ "\t\thttp://homepage.ntlworld.com/jonathan.deboynepollard/FGA/mail-mbox-formats.html\n"