There have been questions regarding this matter. When posting or replying to a post, make sure you have the option checked
You can set this to be the default setting by clicking on
My Account>Preferences
If the above has been selected and your still not getting messages, please note the following below.
When you receive email notifications regarding new posts or replies. It states in the email
"There might be other replies however you will not receive separate notifications for them."
If a user does not visit the topic for which he or she got the above message, no new notifications will be sent.
If you want to receive an e-mail everytime someone posts in a forum, try using
My Account > Watched Forums:Check the boxesnext toforums you are interested in, select "e-mail me posts as they come in", and click "Save".