Hi Khanh dang,
Thanks for contacting Syncfusion support.
It is the process of the forums, that the forum created user gets all the notifications happening in that thread, as a result you will receive the notification emails for the forums you have created. If you are subscribed to any other forums and if you think the forums are not necessary, then please use the Unsubscribe option to unsubscribe from those forums, this will reduce the subscription emails from the forums. And, there is no option to send the email notification for specific forums updates.
Please let us know, if you have any queries.
Regards,
Vijayakumar Y.