Alternatively to make sure they all have an account use a Shared Folder (https://www.dropbox.com/help/files-folders/share-with-others). You can only access them if you have an account. But, note a few things with these: -the share is limited to the size of THEIR quota -there is nothing, at all, to stop them moving the files/folders to another share (or copying) and re-sharing it to others -In shared folders everybody has read/write access unless you set permissions. Some of which, again, are only available for Paying users -everybody in the share will be able to see everybody elses email addresses.
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Was trying to find a similar feature when deciding whether to move over to Dropbox. Currently use a competing service that allows you to require clicking an email verification link to prove you're the intended recipient of the link -- no account required.
Any idea if Dropbox will ever implement something like that? It's a challenge to share stuff when you need added security but the recipient may not be Dropbox user.
Just to be clear—sharing with another Dropbox account is absolutely better than what I mentioned above. Just not always feasible. For that use case I like the approach from Tresorit. Dropbox is a great product!