Incorrect. Not everything is bad!
This is a legitimate Dropbox communication. The sender is “dropboxmail.com”, which is unusual but legitimate, and the URL is a secure link (https) to “dropbox.com”. If you are unsure about a domain, you can use a search engine to find out more information.
Dropbox
no-reply@dropboxmail.com
to me
Hi,
Your Dropbox is full and is no longer syncing files. New files added to your Dropbox folder won’t be accessible on your other devices and won’t be backed up online.
Upgrade your Dropbox today and get 1 TB (1,000 GB) of space and powerful sharing features.
For other ways to get more space, visit our Get More Space page.
Happy Dropboxing!
– The Dropbox Team
P.S. If you need the biggest plan we’ve got, check out Dropbox for Business