16   home.activation.createMuttDirectories =
 
  18       mkdir = dir: ''$DRY_RUN_CMD mkdir -p $VERBOSE_ARG "${dir}"'';
 
  20     lib.hm.dag.entryAfter [ "writeBoundary" ] (
 
  21       lib.concatMapStringsSep "\n" mkdir [
 
  22         "${config.xdg.cacheHome}/mutt/messages"
 
  23         "${config.xdg.cacheHome}/mutt/news"
 
  24         "${config.xdg.cacheHome}/mutt/tmp"