Add a format (f) specifier after the archive retrieval command:
      
list-getf@host
For ezmlm-cron(1), just suffix the format code to the digest code.
The ezmlm-get(1) ``-f'' switch can be used to change the default format (MIME with removal of less relevant headers) to other formats. The format specifiers are the same as for individual archive retrievals (see Specifying the format for retrieved messages).
By default, a single -get request returns a maximum of 100 messages, and a single -index request 2000 subjects entries (20 files of 100 subjects entries each). This can be changed by editing MAXGET, and MAXINDEX in idx.h and recompiling. Remember to edit text/bottom, text/bounce, and ezmlmrc(5) to reflect these changes so that your users won't get confused.