Subject: [name] used Dropbox to share a file with you
This one is a phishing scam. The "Click here to view" link goes to a hacked site that redirects you to a fake Dropbox login page designed to steal your username and password.
Subject: Dropbox Notification
This variation is a little odd. The email body itself has a clickable "From" address that reads "Dropbox Notification". Don't click it. The link is not a reply email address. Like the others, it goes to a hacked site that redirects you to a "dating website" that looks sort of like Facebook.
Subject: [name] "scanned_memo.jpg" via Dropbox
This final example is another phishing scam that may be the most dangerous, as it looks the most legitimate. It includes a Dropbox logo and a clickable thumbnail of what looks like a scanned document. The thumbnail image and text links all go to the same hacked site that redirects you to a fake Google Drive login page trying to steal your username and password.
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