Dropbox’s ongoing investigation into a possible security breach has not produced any evidence that its systems have been infiltrated, MacWorld reported citing an update to the company’s user forum.

“As of today, we’ve found no intrusions into our internal systems and no unauthorized activity in Dropbox accounts,” said the update, posted on Friday, July 20.

The cloud storage company brought in a team of outside investigators to look into complaints that users were receiving spam at email addresses they used solely for Dropbox. Several users reported receiving the same spam messages, spurring fears that the spammers had obtained their email addresses through Dropbox.

“We’ve reached out to users who’ve reported receiving spam messages and are closely investigating those reports. Security is our top priority and we’ll let you know if we uncover evidence that these email addresses came from Dropbox,” a Dropbox staffer wrote.