These pages are on my watchlist:
https://www.mediawiki.org/w/index.php?title=Manual%3ALanguage
https://www.mediawiki.org/w/index.php?title=Translatewiki.net
I edited the English originals of both of them recently.
Today, on September 10th, 2015, two e-mail notifications arrived in my mailbox:

• 1:

Dear Purodha,

The MediaWiki page Manual:Language has been changed on 10 October 2015 by
Shirayuki, see https://www.mediawiki.org/wiki/Manual:Language for the
current revision.

Editor's summary: -

Contact the editor:
mail: https://www.mediawiki.org/wiki/Special:EmailUser/Shirayuki
wiki: https://www.mediawiki.org/wiki/User:Shirayuki

There will be no other notifications in case of further activity unless
you visit this page while logged in. You could also reset the
notification flags for all your watched pages on your watchlist.

Your friendly MediaWiki notification system

To change your email notification settings, visit
[... remainder truncated ...]

• 2

[Almost identical, only referring to the other page]

Opposed to the usual messages of this kind, they do not give me links to the actual changes, not to all changes since these ones. Looking at the page histories, I found no mention of user Shirayukis edits. Looking further, I found no edits to any of these pages, including talk pages, translations, subpages, etc. by Shirayuki in his contributions:
https://www.mediawiki.org/w/index.php?limit=500&tagfilter=&title=Special%3AContributions&contribs=user&target=Shirayuki&namespace=&associated=1&year=2015&month=10

Now, I do not have a clue what might have triggered these e-mail, and where to look further to fix the problem.