Mind you that some of the email notifications cannot be influenced in the settings. They are "necessary" (WGT speak) / "inescapable" (user speak).
Ways out are on the user's side:
- kill filter WGT mails, or
- insert a mail address of yours which you don't read.
Note aside: use of non-existant addresses is evil!
My remedy is a watch filter in my mail program, moving WGT mails to a special folder. This provides a fast means of scanning over them.