Hi there,
We’ve been looking into these spam reports and take them seriously. Back in July we reported that certain user email addresses had leaked and some users had received spam as a result. At this time, we have not seen anything to suggest this is a new issue, but remain vigilant given the recent wave of security incidents at other tech companies. If you’ve received spam to an email account you only use for Dropbox, please send the message (including full headers) to support-security@dropbox.com to help our ongoing investigation.
Separately, we want to apologize for some of the dismissive responses from our volunteer moderators - since they aren’t employed by Dropbox, they don’t have visibility into issues like this. We want you to know that we've taken these reports seriously and began our investigation immediately.