"Many have promised to help us with our overflowing inboxes, but the Mailbox team actually delivered."

And with those words, the extremely popular Mailbox service, of which there is a long waiting list to sign up, became the newest startup to be swallowed up by an even bigger startup.

No details of financial terms were posted, but the post explained the thirteen Mailbox employees will join Dropbox, and continue working on the Mailbox app.

Mailbox is now apparently delivering 60 million messages per day and has taken 1.3 million reservations for its free service.

The Mailbox application for organizing and managing Gmail on Apple iPhone or iPod Touches became a hit after it was released last month on a first-come, first-served basis.

"Rather than grow Mailbox on our own, we've decided to join forces with Dropbox and build it out together," the Mailbox team said in a blog post of its own.  

"To be clear, Mailbox is not going away. The product needs to grow fast, and we believe that joining Dropbox is the best way to make that happen."

Over 100 million people worldwide use the San Francisco-based Dropbox service to store digital photos, documents, or videos in the internet 'cloud' with the ability to access online from any computers, according to Mailbox.

"They've got a ton of experience scaling services and are experts at handling people's data with care," Mailbox said.

"So hold onto your hats, because our time together is just getting started. And thanks again for joining us on the journey to transform the inbox. We’re really excited for what’s ahead."