This feature, often called a return receipt, is not available in Cruzio's email services.
However, some mail programs (such as Outlook, Thunderbird, etc) have this feature built into them. If you have a mail program configured for your Cruzio email account, you may be able to use it to receive an email when the sent message you sent has been read.
For example, instructions for setting up return receipts in Outlook 2003 can be found here
. And instructions for Thunderbird can be found here
. For other mail programs and other versions, instructions can be found through a search on Google.
Hope this helps,
Cruzio technical Support