SO/HO Shipping Simplified | Print Postage. USPS postage! Save time and money when you pay for postage and print shipping labels online. Save time and money by shipping online. Discounts are available on Express Mail ® service, Priority Mail service, and flat-rate shipping! Orange Mailer is an online postage printing service that allows you to purchase and print USPS shipping labels at discounted rates. So start buying USPS postage online from your office / home computer, easily print postage and shipping labels for all USPS mail classes. No more lines at the post office! With Orange Mailer you will send your mailings faster and easier.