Find "Sending account"
Press Menu.
Scroll to Messages and press the Navigation key.
Scroll to Settings and press the Navigation key.
Scroll to Email and press the Navigation key.
Scroll to Sending options and press the Navigation key.
Scroll to Sending account and press the Navigation key.
Select default email account
Highlight the required email account and press the Navigation key.
Exit
Press Disconnect to return to standby mode.