Changing Your Mail Directory

  Mail stores your mail messages in the same directory used
  by the Mail Utility.  If you have not specified a directory to
  be used by the Mail Utility, your default directory is used.
  Depending on the number of mail messages you receive
  and keep, this directory may become cluttered with mail
  messages.  This option lets you choose a different directory in
  which to store your mail messages.

  Click on OK or Apply to save the profile settings.  Click on
  Cancel to leave the settings unchanged.

  Additional topics:

  *   Mail User Options Dialog Box