I had this same problem setting up a new mailbox 4 days ago.
Support was useless, first giving me bad advice about the e-mail address (which has nothing to do with retrieving mail via POP), then ignoring my subsequent message for more than 24 hours.
After about 48 hours, the SMTP service was working, but the POP service was not. (I could send, but not retrieve.) Finally, about 12 hours later, the mailbox started working, and I still had not heard back from tech support.