Yup...from the Hub, pull up the left-side hub selector and shift to the specific email account (rather than the combined account HUB messages list). Then, tap the top blue bar that has your account alias (that you created when you integrated the email account). Scroll through the list to Sent and tap that. You will be presented with a list, from the server, of all Sent Items that are presently in the Sent Items folder on the server.
This process may vary depending on your email account configuration type (ActiveSync versus IMAP versus POP).
Occam's Razor nearly always applies when troubleshooting technology issues!
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