Since the closure of the East London mail centre during the summer of 2012, inward mail for the E postcode area is now sorted at Romford Mail Centre, with the IG and RM postcode area mail.he E postcode area contains two non-geographic postcode districts for high-volume business users, E77 and E98. The Eastern District Office is located on Whitechapel Road and was the eastern terminus for the former London Post Office Railway, which has been mothballed since 2003.