Is this a phishing attempt from em-s.dropbox.com?

Hi, I'm concerned that I may have been phished.

 

I received an email from no-reply@em-s.dropbox.com. After examining the unsubscribe link, I decided it was okay and clicked on it. It looked like this truncated link:  https://links.dropbox.com/e/eh?_t=60154<snip>

 

It all seemed legit to me, but after the click my Windows laptop screen went blank for a moment, and I heard the familiar sound of when a device comes online. At no time did I click on a file (just the unsubscribe link), but I was still worried. So I took the PC offline and changed my passwords.

 

I started researching this email address no-reply@em-s.dropbox.com and it seems to be from Dropbox - https://help.dropbox.com/security/official-domains.

 

Some other articles on the topic:

- https://www.dropboxforum.com/t5/Security-and-Permissions/Possible-Phishing-email/m-p/697557

- https://www.dropboxforum.com/t5/Security-and-Permissions/Is-the-email-em-s-dropbox-com-legitimate-Answer-Yes/td-p/651026

 

So I'm thinking I may have gone on high alert for no reason.

 

Has anyone seen this situation? I still don't understand why Windows behaved the way it did. Perhaps a coincidence?

 

Any support is much appreciated!