Luckily, you can sort mailboxes in Yahoo! Mail by any of the columns.
Sort Messages in Yahoo! Mail
To sort a folder in Yahoo! Mail:
- Click on the column header (read status, From, Subject, Date, Size, attachment status and flag status for Yahoo! Mail; Sender, Subject, Date, or Size in Yahoo! Mail Classic) you want to use for sorting.
- Click again to reverse the sort order.
(Updated September 2012)