New_Mail_Updates

   By default, Pine automatically checks for new mail every 2.5
   minutes (150 seconds). This interval is settable per user as
   the MAIL-CHECK-INTERVAL configuration option (unless the system
   manager choose to fix its value in the PINE.CONF-FIXED file). You
   can also force a refresh of the folder by pressing the DOWN arrow
   key four times at the last message of the Index screen or by
   pressing CTRL/L. A folder is also refreshed whenever you expunge
   it. When you force a check, and you have no new mail, Pine will
   report the last message as new mail even though it is not new.