What is Liteblue USPS? Liteblue USPS is an online Employee relationship management (ERM) portal for USPS Employees. liteblue  website allows employees to get payslip information, access FEHB benefits, manage worksheets, contact Liteblue HR, access TSP account and many other features. Employees can access the official Liteblue USPS Login website at Liteblue.USPS.Gov.