The Mailbox for iPhone email application no longer has a reservation system, its developers announced today. The developers say that improved scaling contributed to this.

Good news! Mailbox is now available without having to wait in line. After 10 weeks of around-the-clock hard work, our engineering team has scaled the Mailbox service to deliver over 100 million messages per day (and growing). We believe we can now confidently handle new users as they sign up, so we’ve pulled down the reservation system.

It is unclear if Dropbox, the new owner of Mailbox, contributed to the new scaling efforts. The developers say that the app processes 100 million emails per day. Yesterday, Mailbox was updated with interface enhancements and new snooze options.

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