As already mentioned since longer, here or there: Notification in regard of page-changes, when subscribed to it, seems not to work, at least not for my person.
Atma guesses that it is a email, "spam" issue, or the sender email has not anewed defined, working for dokuwiki.
Also not sure if anybody takes generally an eye on changes. There is an option that certain email would be informed of all changes. At least in regard of spam or vandalism such might be the safe bet to continue as before by one admin.