evielouise,

The email that you got is simply a notification that someone posted to the thread you left a message on after you did.  If you do not want to get these emails, you need to uncheck the notice immediately under the place where you type in the message that you are adding to the thread.  It says "Notify me when someone replies" .  If you uncheck it, you will not get the emails anymore.

I hope that helps :)

~Viv

Fractals will always amaze me!