WordPress Update E-Mail Spam

Hello all,

Since a few days I have started getting a lot of spam about updates for plugins and about the new wordpress update (Version 4.3.1) while I host multiple site’s for clients (20 – 30) several site’s that said they had an update mailed me the same message over and over (20+ times per site)

I do not have any particular plugins on my site’s that deal with emails. Exception being wordfence. My question is, is wordpress sending these mails over and over or is something else wrong?

This is the mail I received several times it is in dutch, roughly translated it says that it has been updated to 4.2.5 and that a newer version is available, I got this mail around 20 times for this site alone.

Hallo! Je site op https://example.nl is automatisch bijgewerkt naar WordPress 4.2.5.

Om meer te leren over versie 4.2.5, kijk je op het Over WordPress scherm:
https://example.nl/wp-admin/about.php