On Moodle, when discussion forums are setup, there are several options regarding subscription. A user can:
1. be always subscribed
2. be never subscribed
3. have the option of subscribing or not
Subscription means that posts in specified discussion forums are automatically sent to your email. Subscription settings are determined by your FIC.
By default, all students are subscribed to the News Forum. This is reserved for important announcements. Posting here means that all your classmates will receive a copy via email. News Forums are created automatically when a course site is opened.
For additional forums created by your FIC, you are usually subscribed at the beginning, and then you can login and unsubscribe, if you wish. Click on the particular Forum, and look for the option to UNSUBSCRIBE.
If the Forum is set to forced subscription and you do not want this, please discuss the issue with your FIC. There may be a reason for why your FIC wants everyone to be subscribed. If the class finds that too many forums are set at automatic subscription then give this feedback to the FIC so that he/she can change the setup.
Another possibility: For every discussion post that you make, you are given the option of getting an email alert if there are responses to it. (You will find this at the bottom of the screen). Do not select this option if you do not want an email copy of answers to your posts.