lumaxis

tell application "Mail"
  set _accounts to {account "Private", account "Monkeys"}
	set _1ago to (current date) - 1 * days
	set _3ago to (current date) - 3 * days
	set _7ago to (current date) - 7 * days
	
	repeat with _account in _accounts
		set _inbox to mailbox "INBOX" of _account
		set read status of (messages of mailbox "⌛1 Day" of _account) to false
		set read status of (messages of mailbox "⌛3 Days" of _account) to false