Under your username on your start page you will see a red link that says Account / E-Mail Preferences - click that. Then click the EMAIL tab, Check your email settings and then click the SAVE MY EMAIL PREFERENCES link. Hopefully that should take care of your newsletter mail. As long as the box is checked on message board posts, you will receive notification when someone replies as long as your email address on file is correct.
Please let me know if you need additional help and I will be happy to do what I can.