Pick Menu

  The Pick menu items let you search the open or selected
  folder for messages that have something in common.  For
  example, you could pick messages that were sent by a specific
  user on a specific day.

  After it finds messages that meet your criteria, Mail displays
  a list of these messages.  You can then perform tasks, such as
  copying, moving, extracting, or reading, on this set of picked
  messages.

  To pick messages, open or select the folder containing the
  messages and choose the appropriate menu item from the
  main window's Pick menu.

  A dialog box is displayed.  The dialog box lets you specify the
  criteria for picking messages.  Click on the field to be used
  and enter the pick criteria.

  Click on the OK button to pick the designated messages.

  Additional topics:

  *   Picking Messages from a Selected Folder

  *   Picking Messages from the Open Folder