Some not-so-helpful random pict.

Sort the current mailbox by the Subject field.

Use the option key to reverse the sort order.

Sort the current mailbox by the date the messages were sent.

Use the option key to reverse the sort order.

Sort the current mailbox by the person who sent the messages.  (Or, for the Out mailbox only, by the person to whom you sent the messages.)

Use the option key to reverse the sort order.

Sort the current mailbox by message priority.

Use the option key to reverse the sort order.