Why do I get \"Mailbox does not exist\" bounceback from a brand new mailbox?

Problem

Users receive a \"mailbox does not exist\" error message when trying to send email to a newly created mailbox.

Solution

The issue is timing-related and resolves automatically. It can take up to 30 minutes for our MX servers to accept new email for your new mailbox.

Key Points

  • Mailbox passwords, webmail access, and mail client configuration work immediately upon creation
  • MX server configuration updates require up to 30 minutes before accepting incoming mail
  • Bounceback errors received within 30 minutes of mailbox setup are expected and will self-resolve
  • No user action is required — simply wait for the MX configuration to propagate