When I receive an email, I do one of three things:
Most email clients, including Rackspace Email, allow you to easily sort by flags. Flagging the email serves as a visual reminder and a sorting factor. In my inbox, all flagged messages are at the very top. After I’ve completed the action, I un-flag the email and it is removed from the top of the list.
To sort by flags in most email clients, just click on the white flag above the list of emails (in the same line where “From,” “Subject,” “Sent,” and “Size” are).