View by month
To view messages for a certain month or year, you can use the Messages by month toggle (below the list of messages, to the right).
You can only filter messages by month or by year within the current folder. If you do not see any messages for the specified period, make sure you have opened the right folder.
If none of the folders contain a message for the specified period, then the message does not exist in your mailbox. For details on what might cause this issue and how to resolve it, see Messages have disappeared from the mailbox.