How to Expand or Collapse Mailing Lists in the Compose Window

Postbox can expand or collapse mailing lists in the addressing widget of the compose window, depending on your preference. Here's how:

  • Open Config Editor 
  • Type pb.msgcompose.explode_mailing_lists into the "Filter:" textbox
  • Double-click the row for  pb.msgcompose.explode_mailing_lists to change the preference.
  • To have mailing lists expand into individual addresses, set the value to true. This works best if your mailing lists are somewhat small. To have the mailing list collapse into just one addressing bubble, set the value to false, which is great for large mailing lists.
  • Restart Postbox for the change to take effect.