Category on page title problem

I post by email, and the resulting page title for each post has the post title and the category running together – or butted up to each other. There is no space between the two – eg;

“post titlecategory” instead of “post title category”

I don’t need to have the category listed in the page title of the post, but if there isn’t a way of deleting it can it be cleaned up so that the two don’t run together?