It means one of two things; Either the service has been disabled by the service provider or the phone has been locked and disabled after a loss or theft
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It was probably someone with an iPhone and used the little characters/icons in the text. Only people who have iPhones can see them or they will just look like squares if sent to non iPhone users. :)
Regardless of how or why you sent a text message, once it is sent from your phone it is billed as a sent text message.
Sending a text message to an email address can be done through iMessage on an Apple iPhone using iOS. If you don't have an iPhone then this can be done through the TextConnect website.
Message received
The meaning of a particular message depends with the message of the sender to the receiver.