Dear colleagues
It seems that the notifications module has been updated in version 6 of our content management system such that it now notifies you of changed content as well as new content.
As I am going through updating broken links that is generating quite a lot notifications. I've reset the frequency of notifications so there won't be too many emails but I can't change the fact that it is notifying you of changes. Sorry for any inconvenience.
I am just about to start testing the new version of notifications that will hopefully be available within the next two weeks. That is far more configurable, allowing you individually to select the frequency of notifications (amongst other things).