Well, you are more than welcome to if you wish, but when you read read a contribution in a thread you will be given a choice. The programme driving this website allows you to choose whether or not you would like an email notification to tell you of a new addition to a thread you have been reading, or of a new topic which has begun.

If you find you get too many of them you can always change your options and be a bit more choosy. This is a powerful communication tool, to be used to suit your own tastes.