In this paper, we present a mobile English auction agent model (MoEAAM), a next generation E-Auction that allows mobile agents to navigate on E-Auction houses and participate in auctions on the user's behalf even when the user is disconnected from the network. This reduces network latency and bandwidth consumption. Furthermore, MoEAAM provides many significant benefits. These include: mobility, high reactivity, anonymity and privacy for buyers; on-shelf mechanism for seller; high revenue and dispute protocol for auction houses. MoEAAM is designed based on identity-based signature scheme, which allows mobile agents to participate anonymously, and to ensure their privacy and confidentiality. MoEAAM offers strong security without sacrificing efficiency. Indeed, the analyses demonstrate that the computational costs and communication overheads in our protocol are reduced significantly while ensuring system security.