I'm using an SMS service to send messages to a Nokia 7110. The service sends SMS using an alphanumeric originating address ("csoft.co.uk"), but it's displayed in the inbox with a name which I believe is from the user's address book ("chris@lml").

Why is this happening?

Normally (on other Nokia phones, e.g. my 6210), the inbox lists messages from this service by displaying the first 15 or so characters from the message.