An email system for mobile devices, such as cellular phones and PDAs, is disclosed which allows email messages to be played back on the mobile device as voice messages on demand by way of a media player, thus eliminating the need for a unified messaging system. Email messages are received by the mobile device in a known manner. In accordance with an important aspect of the invention, the email messages are identified by the mobile device as they are received. After the message is identified, the mobile device sends the email message in text format to a server for conversion to speech or voice format. After the message is converted to speech format, the server sends the messages back to the user's mobile device and notifies the user of the email message and then plays the message back to the user through a media player upon demand.