Is this the legit confirmation message from Dropbox? Notice the reply link at the bottom of the body of the message:
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Subject: Please verify your email address
Date: Fri, 01 Sep 2017 00:34:48 +0530
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Hi chip,
We just need to verify your email address before your sign up is complete!
Verify your email
<http://gestionale-orbit.it/dropbox.html>
Happy Dropboxing!