Google My Business does send out emails asking those who have not logged into their Google My Business account in a while, to log back in to stay verified. The email does not appear to be a phishing scam, but rather something Google has done for a while now.
The email says "Stay verified on Google My Business. It looks like you haven't signed in to your account in a while. So, in 30 days, the following Business Profiles will be unverified due to inactivity."
Here is a screen shot:
Maybe this is a way for removing spam from Google My Business? I am not sure.
Colan Nielsen said in the Local Search Forums "Google sends out a batch of those emails every once in a while. I think they have been doing it for a few years at least."
Forum discussion at Local Search Forums.
