With dwindling letter or document traffic, the department is focusing on the fast-growing parcel segment, the official said, adding that various measures have been taken to modernise the department under the Digital India initiative. As part of initiatives to leverage the e-commerce sector, the department has forged tie ups with leading online marketplaces like Snapdeal, Amazon, Paytm and Yepme for parcel delivery and has also set up modernised 48 centres to handle the packages.