How to keep messages from automatically being marked as read

Whenever a single message or conversation is selected, by default it will automatically and immediately be marked as read. Under Preferences > Advanced > General you can change this behavior to:

  • Not immediately mark messages as read.
  • Mark messages as read only after a few seconds, so you can glance at a message, and then move on to another before it can be marked as read.

Additionally, for conversations there's a hidden preference to not have messages marked as read when you select the conversation summary row.  To set this:

  • Open Config Editor.
  • Enter pb.always_mark_as_read into the "Filter" textbox.
  • Double-click on pb.always_mark_as_read to change the value from true to false.