The emails about question-answers received in email consist of a question or one of its answer. It will be useful for the reader if the question and its answers are listed in the email itself so that jumping to website is not required.
It is a bit difficult to implement this behavior, for a series of reasons.
The basic one is: how can one question get its answer if you don’t send it until it gets its answer?
You might try to play with your own notification settings, maybe opting for a weekly digested summary.