UPDATE: We are again receiving reports with "User Unknown" bounceback errors. We have notified the mail and Google Apps administrators.
UPDATE: This issue should be resolved. If you continue to recieve "User Unknown" bounceback errors contact 4Help by visiting 4help.vt.edu.
UPDATE: If people emailing your VT Google Apps email address receives a "User Unknown" bounceback, then you will need to update your VT Google Apps Mail password. See Changing your VT Google Apps Mail Password
4Help is receiving reports that people emailing certain @vt.edu addresses (specifically VT Google Apps accounts created recently) are receiving bouncebacks of "User Unknown" despite the VT Google Apps email account existing.